Wednesday

November 25, 2015
**Precalc Trig**

here's the question: solve for cos(2theta)=1 if you graph r= cos(2Theta) then graph r=1 you find that there are four places where the graphs intersect. however, when solved algebraically, there are two solutions which can be represented in an infinitely many format as: ...
*Friday, November 20, 2015 by Wulramm*

**Trig right triangle**

A ship leaves port at 6 am and heads due east at 20 knots. At 10 am, to avoid a storm the ship changes course to N 47°. Find the ships distance from port at 4 pm.
*Tuesday, November 17, 2015 by Ken*

**Trigonometry **

Use trig form to find quotient 3/(2+3i)
*Tuesday, November 17, 2015 by Shannon*

**Trig**

A ship leaves port at 6 am and heads due east at 20 knots. At 10 am, to avoid a storm the ship changes course to N 47° E.. (47° east of north). Find the ships distance from port at 4 pm.
*Monday, November 16, 2015 by Isaac*

**Trig **

I've done this one multiply times yet it never seems to work out, I'm supposed to simplify yet it never works out tan(csc^-1(x/x-1)) my first step; sin/cos(1/sin(x/x-1))
*Monday, November 16, 2015 by Anna *

**Math**

The current, I, in amperes, for an electric circuit is given by the formula I=4.3sin120(pi)t, where t is time, in seconds. a)At what time is the current at its max volume? How does your understanding of co terminal angles help in your solution? b)What time is the current at ...
*Friday, November 13, 2015 by Bethany*

**Trig**

Find all angles θ between 0° and 180° satisfying the given equation. (Enter your answers as a comma-separated list. Round your answers to one decimal place.) Sin θ = 1/4
*Monday, November 9, 2015 by Amanda*

**Calculus**

how do you solve this trig identity? i don't get it at all! cos(a+b)cos(a-b)=cos^2a-cos^2b-1
*Monday, November 9, 2015 by sakura*

**trig**

The angle of elevation from a point on the ground to the top of a tree is 38.7 degrees. The angle of elevation from a point 27 ft farther back to the top of the tree is 22.9 degrees. Find the height of the tree to 2 decimal places.
*Monday, November 9, 2015 by jake*

**Physics**

In a fast-pitch softball game the pitcher is impressive to watch, as she delivers a pitch by rapidly whirling her arm around so that the ball in her hand moves in a circle. In one instance, the radius of the circle is 0.608 m. At one point on this circle, the ball has an ...
*Wednesday, November 4, 2015 by Deven*

**trig**

Find the component form of v and sketch the specified vector operations geometrically, where u = 4i − j, and w = i + 5j. v = −u + w v = ( , )
*Monday, November 2, 2015 by Jose*

**trig**

Find the magnitude and direction angle of the vector v. v = 4(cos 125°i + sin 125°j) ||v|| = θ =
*Monday, November 2, 2015 by James*

**trig**

Find the component form of v given its magnitude and the angle it makes with the positive x-axis. Sketch v. Magnitude Angle ||v||= 7/2 45 degrees v=( , )
*Monday, November 2, 2015 by amanda*

**trig**

An airplane is flying in the direction 148° with an airspeed of u = 920 kilometers per hour. Because of the wind, its groundspeed and direction are v = 820 kilometers per hour and 140°, respectively (see figure). Find the direction and speed of the wind.
*Monday, November 2, 2015 by bob*

**Trig application**

I can't figure this out. A famous golfer tees off on a long, straight 459 yard par 4 and slices his drive 10 degrees to the right of the line from tee to the hole. If the drive went 288 yards, how many yards will the golfer's second shot have to be to reach the hole?
*Thursday, October 29, 2015 by William*

**Trig**

I need help with this application. A pier 1250 meters long extends at an angle from the shoreline. A surveyor walks to a point 1500 meters down the shoreline from the pier and measures the angle formed by the ends of the pier. It is found to be 53 degrees. What acute angle ( ...
*Tuesday, October 27, 2015 by Hutch*

**Math**

Find the exact value of the trig expression given that sin u = -5/13 and cos v = -4/5. u and v are in the second quadrant. cos(v - u)
*Sunday, October 25, 2015 by Anonymous*

**trig**

an electric hoist is used to life a piece of equipment y = 2.6 feet. the diameter on the hoist is x = 12 inches. find the number of degrees through which the drum must rotate (round to the nearest integer). *I do apologize, there is a figure in my question, but I cannot paste ...
*Wednesday, October 21, 2015 by xiahou*

**Trig**

mercury rotates around the sun in approx. 89 earth days (or 7,689,600 s. use a calculator to approximate its angular speed. choices: 4.09x10^-7 0.035 0.071 8.17x10^-7
*Wednesday, October 21, 2015 by Bill*

**Trig**

a smokestack is 190 feet high. a guy wire must be fastened to the stack 30.0 feet from the top. the guy wire makes an angle of 39.0deg with the ground. find the length of the guy wire
*Wednesday, October 21, 2015 by Struggler in math*

**Math (Trig)**

A ship leaves port at noon and has a bearing of S 25° W. The ship sails at 15 knots. How many nautical miles south and how many nautical miles west does the ship travel by 6:00 P.M.? (Round your answers to two decimal places.) Miles South? Miles West?
*Wednesday, October 21, 2015 by Rafael*

**Trig**

The width of the box is 9 inch more than its length and the height of the box is 1 inch less than its length write an expression for the volume of the box
*Thursday, October 15, 2015 by Jim*

**functions and trig**

write the transformation of X cubed if it is shifted right four units and then reflected over the X axis
*Monday, October 12, 2015 by sarah*

**physics**

The problem propmpts us with the info: "Two friends play with a card-board box on a grassy hill side. The boy in the box has a mass of 50.0 kg and the box has a mass of 5.00 kg. The incline of the hill is 44° and its height is 10 meter. Assume that friction plays a ...
*Sunday, October 11, 2015 by ana*

**trig**

given cotθ = (1/2) √7, find sinθ and cosθ in quadrant I cotθ = x/y would 1/2 be the x and √7 be the y?
*Saturday, October 10, 2015 by coco*

**trig**

1) given cotθ = 1/2√7, find sinθ and cosθ in quadrant I 2) given tanθ = √5, find secθ and cotθ in quadrant III
*Saturday, October 10, 2015 by coco*

**precalculus**

find the values of the requested trig functions using the given value and quadrant in which the point corresponding to the angle lies. quadrant II; sinθ=4/5 find cosθ and tan θ
*Saturday, October 10, 2015 by glen*

**math**

identify all of the basic trig functions that fit each description. 1) is negative for angles in the 2nd and 4th quadrant 2) is unbounded answer: tan, cot 3) has a range of -1 ≤ y ≤ 1 answer: sin, cos are my answers correct? and i'm not sure what the answer to ...
*Friday, October 9, 2015 by stewie*

**Trig**

Having completed another stimulating school day, Michael and Alyssia both leave at the same time. They walk together for a while and then go their separate ways. These paths make a 60° angle with one another. Michael toddles along at 2ft/sec, while Alyssia speeds off at ...
*Friday, October 9, 2015 by Anon*

**Physics/trig**

A fire hose ejects a stream of water at an angle of 33.6 ° above the horizontal. The water leaves the nozzle with a speed of 29.6 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose be located to hit the highest possible fire?
*Friday, October 9, 2015 by Jenna*

**trig**

1) cos^2(x)/sin^2(x) 2) tan(x)cot(x)-sin^2(x) 3) 1-sin(x)cos(x)tan(x)
*Thursday, October 8, 2015 by gen*

**Math (Trig)**

A triangle ABC has a trisected angle A. The angle trisectors divide side a (opposite angle A) into three segments which are BD, DE, and DC. The lengths are 2, 3, and 6, respectively. What are the lengths of the other sides?
*Monday, October 5, 2015 by Z*

**trig**

The angle relative to the horizontal from the top of a tree to a point 12 feet from its base(on flat ground) is 30*. Find the height of the tree.
*Wednesday, September 30, 2015 by rita*

**calculus**

1. what trig function has an amplitue of 1 and negative values for angles between π/2 and π? 2. what trig function never crosses the x-axis and has a value of 2 at π/6? are these correct? 3. what trig function has a period of π and is undefined for -π/...
*Monday, September 28, 2015 by anon*

**trig**

A skateboard wheel has a radius of 2.08 inches and is turning at a rate of 945 rpm. a. what is the angular speed in radians per second? in degrees per second? b. how fast is the skateboard traveling (in miles per hour)?
*Saturday, September 26, 2015 by Mohamad*

**Precalc**

Identify all of the trig functions that fit each description: 1. Has a amplitude of 1 2. Is discontinuous at odd multiples of π/2 3. Is continuous at odd multiples of π/2 4. Has sin x as a denominator value 5. Is completely bounded 6. Has the exxact same value at &#...
*Tuesday, September 22, 2015 by Anon*

**Trigonometry **

find the value for the indicated trig function for ø, if ø is an angle in standard position with the terminal side defined by the given point. (18,24); find cos ø
*Tuesday, September 22, 2015 by Kimmy*

**Trig**

The foot of a ladder is on level ground 1.5m from a wall. The ladder leans agents the wall. The angle formed by the ladder and the ground is 70 degrees. Calculate how high up the wall the ladder reaches.
*Tuesday, September 15, 2015 by Emily*

**trig **

If each leg has length 5 meters, what are the lengths of the other leg and the hypotenuse
*Thursday, September 10, 2015 by drake *

**Math Trig**

A plane's flight path called for it to fly from J to W. W is 200kms due North and 500kms due west of J. Draw a coordinate picture. What bearing will the pilot fly and what distance will he or she go in air kilometers?
*Monday, September 7, 2015 by K*

**Physics/trig**

During takeoff, an airplane climbs with a speed of 300 m/s at an angle of 36 degrees above the horizontal. The speed and direction of the airplane constitute a vector quantity known as the velocity. The sun is shining directly overhead. How fast is the shadow of the plane ...
*Thursday, September 3, 2015 by Jenna*

**Trig**

Evaluate the following expression: sin(cos^-1(12/13)) tan(sin^-1(3/5)) I do not know what the inverse values would be...how would I work through this?
*Wednesday, August 26, 2015 by Lillian*

**Trig**

Find all solutions of the equation in the interval [0,2pi). 2sin theta+1=0. Write answer in radians in terms of pi.
*Wednesday, August 19, 2015 by James*

**Trig**

cos 13 pi = ?
*Saturday, August 8, 2015 by Anonymous*

**math trig **

Solve for x if 3sin2x - 3sinx = 2 - 4cosx 0<x<180
*Tuesday, August 4, 2015 by ntsoaki*

**trig**

If sinx=3 cosx, then what is sinx∙cosx?
*Thursday, July 30, 2015 by Alexa*

**Trig**

Solve, algebraically or with justification (no graphing calculator solutions allowed), the following equation: tan7x-sin6x=cos4x-cot7x
*Thursday, July 30, 2015 by Alecs*

**Trig**

What is the value of tanx given that sinx+cosx=1/5 and π/2<x<π ?
*Thursday, July 30, 2015 by Erikhelp*

**Trig**

Algebraically find the value of: 10 cot(cot^(-1)3+cot^(-1)R89;7+cot^(-1)13+cot^(-1)21 )
*Thursday, July 30, 2015 by Erikhelp*

**Trig**

Write an algebraic expression for the following: sin(arctan〖(x+1)/(x-1)〗 )
*Thursday, July 30, 2015 by Alexa*

**Trig**

Prove the identity: (sin(2x-y)+siny)/(cos̼9;(2x-y)+cosy )=tanx
*Thursday, July 30, 2015 by Alexa*

**trig**

The hypotenuse of a right triangle has length 8. The area of the triangle is also 8 units squared. What is the perimeter of the triangle?
*Wednesday, July 29, 2015 by Alexa*

**trig**

what is terminal point of 5pi/4?
*Tuesday, July 28, 2015 by KLL*

**trig**

A road has a 10% grade (slope). To the nearest degree what is the angle of elevation of the road?
*Tuesday, July 14, 2015 by Lake*

**Maths trig**

Sketch the graphs of f(x)=3overx+1 and g(x)=-2x-4 on the same set of axes
*Wednesday, June 17, 2015 by Lulu*

**Maths trig**

Sketch the graphs of f(x)=3overx+1 and g(x)=-2x-4
*Wednesday, June 17, 2015 by Lulu*

**trig**

Help with simplest form sin(2pift - pi) + sin(2pift + pi)
*Tuesday, June 16, 2015 by sheree*

**trig**

A radio transmission tower is 471.0 feet tall. A guy wire is to be attached 6 feet from the top and is to make an angle of 23.1 degrees with the ground? How many feet long should the guy wire be? I am confused on how to find the equation for this problem so that I may work it ...
*Tuesday, June 16, 2015 by Coaco*

**Trig/ algebra 2**

if f(x) = sin4x-cos2x, find f(pi/8)
*Wednesday, June 10, 2015 by Mika*

**Trig/Geometry**

Wendy spots a pizza delivery car as she is looking down at a 15° angle from the top of her apartment building, which is 145 ft tall. How far away is the car from the base of the building? Round to the nearest hundredth. A. 45.98 ft B. 3.56 ft C. 38.85 ft D. 68.78 ft I keep...
*Thursday, May 28, 2015 by Rothko*

**trig**

An airplane is heading north at an airspeed of 500 km/hr, but there is a wind blowing from the northwest at 50 km/hr. how many degrees off course will the plane end up flying, and what is the plane's speed relative to the ground? So here is my work... 50cos(45)+500= 535....
*Thursday, May 28, 2015 by Dan*

**Trig**

Find sin2theta, cos2theta, and tan2theta for costheta = -12/13 in pi < theta < 3pi/2. My answers: 20111/24336 for tan2theta. 144/169 for cos2theta -120/338 for sin2theta
*Wednesday, May 20, 2015 by Anonymous*

**Trig**

For 90<theta<180, cos theta = -(5/13). Which is sin theta? 1. - sqrt 13/9 2. - sqrt 9/13 3. sqrt 9/13 4. sqrt 13/9 3?
*Wednesday, May 20, 2015 by Anonymous*

**Trig**

Which is cos2 theta if sin theta = -2/sqrt13 and 180 < theta < 270? 1. -(13/5) 2. -(5/13) 3. 5/13 4. 13/5 3?
*Wednesday, May 20, 2015 by Anonymous*

**algebra 2 and trig**

The scores on a chemistry test are normally distributed. Approximately 95 percent of the scores fell between 78 and 92. What is the standard deviation for this distribution?
*Monday, May 18, 2015 by caroline*

**Trig**

Solve each equation for the given domain. cos^2 theta + cos theta - 1 = 0 for 0-180.
*Saturday, May 16, 2015 by Anonymous*

**Trig**

Solve the equation for the given domain. 4cos^2 θ = 1 for 0 to 360 degrees. I get 60, 120, 240, and 300. Are these correct? If so, how would I represent them with some sort of expression?
*Saturday, May 16, 2015 by Anonymous*

**Trig Identities**

Prove the following identities: 13. tan(x) + sec(x) = (cos(x)) / (1-sin(x)) *Sorry for any confusing parenthesis.* My work: I simplified the left side to a. ((sinx) / (cosx)) + (1 / cosx) , then b. (sinx + 1) / cosx = (cos(x)) / (1-sin(x)) I don't know how to verify the ...
*Tuesday, May 12, 2015 by Taylor *

**Trig identities**

Sin x/[1-cos(-x)] = csc x + cot x Please Verify the Identity. I have been going in circle with this one... Just a hint would be nice. Thank you.
*Tuesday, May 12, 2015 by Ryan*

**trig**

a vertical pole 35 feet high, standing on sloping ground, is braced by a wire which extends from the top of the pole to a point on the ground 25 feet from the foot of the pole. If the pole subtends an angle of 30 degree at the point where the wire reaches the ground, how long ...
*Sunday, May 10, 2015 by thrish*

**Trig**

A ladder 35.4 feet long is leaning against an embarkment inclined 62.5 degrees to the horizontal. If the bottom of the ladder is 10.2 feet from the embarkment, what is the distance from the top of the ladder down the embarkment to the ground?
*Sunday, May 10, 2015 by thrish*

**trig**

From a certain point, the angle of elevation of the top of the building is 38. From a point 75 feet nearer the building, the angle of elevation is 65. Find the height of the building.
*Saturday, May 9, 2015 by thrish*

**Trig**

Two pilots take off from the same airport. Mason heads due south. Nancy heads 23 west of south. After 400 land miles, how far is Nancy from Mason’s route? I think 156.29, but I'm not sure because the question comes in a lesson on sum and difference identities...
*Saturday, May 9, 2015 by Anonymous*

**Trig**

Find sin(s+t) and (s-t) if cos(s)= 1/5 and sin(t) = 3/5 and s and t are in quadrant 1. =Sin(s)cos(t) + Cos(s)Sin(t) =Sin(1/5)Cos(3/5) + Cos(-1/5)Sin(3/5) = 0.389418 Sin(s-t) =sin(s)cos(t) - cos(s)sin(t) =sin(-3/5)cos(1/5) - cos(1/5)sin(3/5) =Sin-3/5 cos-3/5 = -0.46602 HELP ...
*Thursday, May 7, 2015 by Sally*

**Trig**

Find each value if sin A = 12/13 with 90 degrees <= A <= 270 degrees and if sin B = -7/25 with -90 degrees <= B <= 90 degrees. sin(A - B) sin(A + B)
*Wednesday, May 6, 2015 by Anonymous*

**Trig**

secθsinθ is equivalent to: Ans: tanθ?
*Wednesday, May 6, 2015 by Anonymous*

**trig**

2-sec=5+sec
*Monday, May 4, 2015 by genny*

**trig**

Find the values of sin 0, cos 0, and tan 0ƒáif the angle 0ƒáis in standard position and its terminal side passes through the point (¡V15, 8). Give answers as fractions.
*Sunday, May 3, 2015 by justin*

**trig**

Find the bearing and airspeed for a plane to fly 630 miles due north in 3 hours if the wind is blowing from a direction of 318* and is blowing at 15mph. Approximate the bearing to the nearest degree and the speed to the nearest mile per hour.
*Tuesday, April 28, 2015 by lynn*

**trig**

Forces of 15 kg and 10 kg act on a point with an angle of 60◦ between the forces. Find the magnitude of the resultant force (to nearest tenth of a kilogram) and the angle (to the nearest degree) the resultant makes with the 15 kg force
*Tuesday, April 28, 2015 by syed*

**Physics**

The equation of a transverse wave traveling in a string is given by y(x,t) = 10 cos (π/2)(0.0050x - 8.0t + 0.57), in which x and y are expressed in centimeters and t in seconds. Write down the equation of a wave which, when added to the given one, would produce standing ...
*Tuesday, April 28, 2015 by Nora*

**Trig**

If tan x = -sq rt3/3 and cos x = -sq rt3/2, the measure of <x is?
*Friday, April 24, 2015 by Patti*

**Trig**

The graph of y-7 cosθ + 24 sinθ would be a sinusoid if it were plotted. What would be the first positive value of θ at which there is a high point?
*Wednesday, April 22, 2015 by Elle*

**Trig**

Please help with this question: A plane travels a distance of 140 km due west of Vancouver International Airport. It then travels 60 km at a bearing of 340 degrees. How far from the Airport is the plane? Thank you for all your help.
*Monday, April 20, 2015 by Cassandra*

**Trig**

Can you please help with this trig question: The angle of elevation to the top of a nearby mountain is 46 degrees. After walking 1 km toward the mountain, you determine the angle of elevation to be 68 degrees. How high is the mountain? Thank you for all your help.
*Monday, April 20, 2015 by Cassandra*

**Trig**

Prove that : (Sin Ө + Cosec Ө)/(Tan Ө+Cot Ө) = Sin Ө + Cos Ө
*Sunday, April 19, 2015 by Someone*

**Precalculus Trig (Geometry)**

A rectangular doorway is 38 meters wide and 60 meters high. The doorway is capped with a semi-ellipse that is 13 meters high at its center. Find the height h of the doorway and window 5 meters from the center. From the ellipse equation, I can see that a should be 19 and b ...
*Sunday, April 19, 2015 by Michele*

**Precalculus Trig (Geometry)**

A large doorway has the shape of a parabolic arch. The doorway is 20 feet high at the top of the arch and 20 feet wide at the base. At a height of 10 feet above the floor, find the width of the arch. If you start the vertex of the parabola at 0,0, that means the equation ...
*Sunday, April 19, 2015 by Michele*

**trig**

Karen earns 43 dollars per week working pt at a bookstore. she makes one dollar more for each book she sells. the amt A, in dollars that Karen earns in a week ifshe sells b books is given in the function A(b) =43 + b how much does she earnin a week if she sells 22 books?
*Saturday, April 18, 2015 by denise*

**geometry/trig**

Initially a fifty foot ladder rests against a wall. As I start to climb it, the ladder slides down, finally stopping such that the ladder touches the wall at a point 8 feet below where it originally touched the wall. During the slide, the base of the ladder slid 16 feet from ...
*Wednesday, April 15, 2015 by eman*

**trig**

solve triangle ABC which have angleA=25.25,angleB=60.51 and a=3.82..find c...,find b
*Saturday, April 11, 2015 by jose*

**trig**

if sin23=p,write down the following in terms of P *cos113 *cos23 *sin46 so i draw the diagram an solve for x in terms of P an got 1-p so i dont know how to apply cos113and sin46 in terms of 23 or P but *cos 23 i wrote it as> 1-p/1 wch is 1-p
*Sunday, April 5, 2015 by onika*

**Calculus**

1. integral (x^3 * sqrt(x^2-4)) dx I'm confused on how to start this problem, if I am doing trig substitution.
*Sunday, April 5, 2015 by K*

**trig**

How do I verify this? Cos^4x-Sin^4x=1-tan^2x/sec^2x
*Thursday, April 2, 2015 by Alli*

**Calculus 2 (Differential Equation)**

How would you solve the following problem explicitly? Sqrt(1-y^2) dx - sqrt(1-x^2) dy I separated the x and y terms and got: Integral of 1/sqrt(1-x^2) dx = Integral of 1/sqrt(1-y^2) dy I was wondering how would you take the anti-derivative of each function. I believe we are ...
*Thursday, March 26, 2015 by Rena*

**Trig**

An isosceles triangle has legs 4 feet long. If the vertex angle measures 30 degrees, find the length of the base.
*Monday, March 23, 2015 by Anonymous*

**trig**

If cos A= -6/7, in quadrant 2, determine the exact value of tan 2A I don't understand how to do this?
*Sunday, March 22, 2015 by Jennifer*

**trig**

y= 3 cos(x+pi)-3
*Thursday, March 19, 2015 by ana grace barba*

**trig**

A gear with a radius of 32 centimeters is turning at pi/9 radians/sec. What is the linear speed (velocity) at a point on the outer edge of the gear?
*Sunday, March 15, 2015 by Chris*

**calculus trig substitution**

∫ x^3 √(x^2+9) dx If you work it can you write the steps? I really don't like the way my teacher teaches it. Someone else doing it might help.
*Saturday, March 14, 2015 by Allie*