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March 31, 2015

March 31, 2015

**Recent Homework Questions About Trigonometry**

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**trig**

a 7 foot tall man is standing 65 feet away from a tower. if the angle of elevation is 35 degrees. what is the height of the tower to nearest tenth of a foot?
*Wednesday, April 18, 2012 at 11:11am*

**mth, trig**

Given cos a=-7/25 in quadrant II , and sin b=-12/13, in quadrant IV , find cos(a+b) and sin2a
*Wednesday, April 18, 2012 at 11:10am*

**Trig**

Can anyone help with this question. Now suppose that, starting with the ﬁrst row of seats, the ﬂoor of the seating area is inclined at an angle of Theta = 25 degrees above the horizontal, and the distance that you sit up the incline is x, as shown in the ﬁ...
*Tuesday, April 17, 2012 at 4:49pm*

**Trig**

Can you show us how to use law of cosines to show that theta equals inverse cosine of (a^2 + b^2 -484)/(2ab) where a^2=(7+xcos a)^2 + (28-xsin a)^2 and b^2=(7+xcos a)^2 + (xsin a -6)^2? Thanks
*Tuesday, April 17, 2012 at 8:00am*

**trig**

A 100 kg box slides with constant velocity down a ramp inclined at 20 degrees, with the horizontal. Find the frictional force acting on the box.
*Tuesday, April 17, 2012 at 4:15am*

**Trig**

How do you find the exact circular function value of csc(-23pi/6)? I dont know how to do the pi symbol on the keyboard.
*Monday, April 16, 2012 at 1:12am*

**trigonometry**

given that sin alpha/2 = 2/3, and that alpha/2 is in quadrant II, determine the exact values of all trig functions for alpha.
*Sunday, April 15, 2012 at 12:06pm*

**trig**

A submersible traveling at a depth of 250 feet dives at an angle of 15 degrees with respect to a line parallel to the water's surface. It travels a horizontal distance of 1500 feet during the dive. What is the depth of the submersile after the dive?Explain how the angle of...
*Sunday, April 15, 2012 at 10:53am*

**Math- Trig**

1. Determine the exact value of cos^-1 (pi/2). Give number and explanaton. 2. Determine the exact value of tan^-1(sq. root 3). with explanation. 3. Determine exact value of cos(cos^-1(19 pi)). with explanation. 4. Determine the exact value of sin(sin^-1(20 pi)). with ...
*Saturday, April 14, 2012 at 9:15pm*

**Trig/PreCalc**

Teach me how to express 5sqrt3 - 5i in polar form please. I don't want you to do the work for me. Just show me the steps I need to do the work properly on my own. Otherwise I will not pass this class or the exam when I enter college, and I do not want to retake PreCalc. ...
*Friday, April 13, 2012 at 3:44pm*

**Trig**

How do i find the exact value of sin 15 using the half angle formula
*Friday, April 13, 2012 at 3:17pm*

**Trig**

can I please have help with these 3 questions? 1. Solve this equation graphically on the interval [0, 2ð]. list the solutions. sin(2x)-1=tan x 2. solve sin x cos x= sqrt3/4 3. solve tan^2 x-3tan x+2=0 thank you! show step by step please.
*Friday, April 13, 2012 at 2:02am*

**algebra-trig help ASAP**

Can someone please help me understand how to graph y=3cos(x/4)-5
*Thursday, April 12, 2012 at 2:58pm*

**algebra-trig**

Can someone please explain to me how to graph sine and cosine step by step because I am so confused and I really really need help.
*Thursday, April 12, 2012 at 1:19pm*

**algebra-trig**

Can someone please explain to me how to graph sine and cosine step by step because I am so confused and I really really need help.
*Thursday, April 12, 2012 at 1:19pm*

**Math - Trig**

A projectile is fired with an initial velocity of 88 ft/sec at an angle of 35° to the horizontal. Neglecting air resistance, what is the time of impact? I just can't figure it out.
*Wednesday, April 11, 2012 at 12:22pm*

**microsoft excell 2007**

entering the formula=SUM(C5:C18)is cell C19 will resolve in which of the following? (a)cells C5 and C18 will be added together (b)cells C5 and C18,and C19 will be added together (c)the total of cells C5 to C19 will appear in cell C19 (d0the total of cells C5 to C18 will appear...
*Wednesday, April 11, 2012 at 10:34am*

**microsoft excell 2007**

when working with predefined formulas in excel,what category contains the boolean functions? (a)math and trig (b)recently used (c)logical (d)auto sum my answer is c debbie needs to print her table.which of the following is not an excel print program? (a)title (b)table (c)...
*Wednesday, April 11, 2012 at 6:53am*

**trig/precalc**

a car's flywheel has a timing mark on it's outer edge. the height of the timing mark on the rotating flywheel is given by y=3.55sin[x - (pi/4)]. graph one full cycle of this function. I was not taught how to graph a function like this, only the simple y= sin x and y= ...
*Tuesday, April 10, 2012 at 6:07pm*

**Trig **

Rewrite 7pi/5 in degrees.
*Tuesday, April 10, 2012 at 3:17pm*

**trig**

solve the equation of the domain 0¡Ü¦È¡Ü2¦Ð 3cos^2theta - 5costheta -1 = 3sin^2theta
*Monday, April 9, 2012 at 10:29pm*

**Trig**

A ferris wheel has a 14 meter diameter and turns counterclockwise at 6 rpm. a) Assuming that the center of the wheel is the origin of an x-y coordinate plane, write functions to find the position (x,y) of a rider that starts at the bottom of the wheel. b) Where is the rider 2 ...
*Sunday, April 8, 2012 at 7:54pm*

**Trig **

Find the supplement of pi/6
*Sunday, April 8, 2012 at 6:58pm*

**Trig-desperate**

f(x)=sin2x and g(x)=1/2tanx for x is the element of [-90;180] 8.1)calculate the x-coordinates of the points of intersection of f and g.
*Sunday, April 8, 2012 at 5:24am*

**TRIG**

Factor 4cos^2x+4cosx-1=0
*Saturday, April 7, 2012 at 7:19pm*

**Trig**

Factor 4cos^2x+4cosx-1=0
*Saturday, April 7, 2012 at 7:04pm*

**Trig **

What is the supplement of 3pi/5?
*Saturday, April 7, 2012 at 3:28pm*

**Trig **

Complete the following statement. (1-sinθ)(1+sinθ)
*Saturday, April 7, 2012 at 3:20pm*

**Trig**

Find the co terminal angle for 15pi/4
*Saturday, April 7, 2012 at 2:44pm*

**Trig **

19pi/7 Which quadrant does the terminal side lie on?
*Saturday, April 7, 2012 at 2:06pm*

**Trig-help please**

Sin23=p write cos113 in terms of p
*Friday, April 6, 2012 at 1:33am*

**Trig Help Please!!!**

Find the indicated angle è. (Use either the Law of Sines or the Law of Cosines, as appropriate. Assume a = 95 and c = 137(angle B=38). Round your answer to two decimal places.)
*Thursday, April 5, 2012 at 11:43pm*

**trig**

if one of a quadratic equation is 1/2-2i, what is the equation. the other root is 1/2+2I but i dont know how to find the equation
*Thursday, April 5, 2012 at 11:02pm*

**trig**

if sin2x=3sin2y, find 2tan(x-y)
*Thursday, April 5, 2012 at 10:17pm*

**alg2/trig**

If 4x^2+9=kx, what value of k will produce equal roots? the answer is 12 but i dont understand how you get it, please help!
*Thursday, April 5, 2012 at 10:07pm*

**Trig.**

Find to the nearest degree, all values of ө less than 360˚ that satisfy the equation 2tan^2θ-2tanθ=3
*Thursday, April 5, 2012 at 8:48pm*

**Trig.**

What is the trigonmetric fact for sin 3.14/8?
*Thursday, April 5, 2012 at 11:39am*

**trig**

simplify cox^2x-cos^4x
*Thursday, April 5, 2012 at 11:30am*

**trig**

Prove: 1/cos2A+sin2A/cos2A=sinA+cosA/cosA-sinA
*Thursday, April 5, 2012 at 8:44am*

**trig**

Prove: 1/cos2A+sin2A/cos2A=sinA+cosA/cosA-sinA
*Thursday, April 5, 2012 at 8:43am*

**trig**

If sin A= 1/4 and sin B= -1/2, with A in QII and B in QIV, find tan(A+B)
*Thursday, April 5, 2012 at 12:08am*

**Trigonometry**

I'm having a lot of trouble with graphing trig functions. Can anyone tell me how to graph this equation on a graphing calculator? Sketch the graph of y= sin x in the interval 0 ≤ x ≤4π
*Tuesday, April 3, 2012 at 6:25pm*

**trig**

what is the amplitude of f(X)=-6sin(3x-7)
*Tuesday, April 3, 2012 at 12:11pm*

**trig**

cos(sin^-1 x)=sq rt(1-x^2) prove the identity
*Monday, April 2, 2012 at 3:57pm*

**trig**

2cos^2 22.5-1 (find exact value)
*Monday, April 2, 2012 at 12:47pm*

**Trig**

1)y=1-tan(3pi-2x) Find period and phase shift 2)y=-sin(5x+3) Find amplitude,period,and phase shift 3)y=1-sin(3pi-2x)Find amplitude,period,and phase shift 4)y=2csc(2x-1)Find period and phase shift 5)Given the graph of y = sin (x), what transformation can be made to make the ...
*Sunday, April 1, 2012 at 9:04pm*

**Trig**

y=sin(2pi*x-pi) find the amplitude, period, and phase shift
*Sunday, April 1, 2012 at 8:59pm*

**Trig**

y=sec(2x+1) Find the period and phase shift. Sorry i'm really bad at these.
*Sunday, April 1, 2012 at 8:50pm*

**Trig**

y=2tan(x-1) Find the period and phase shift.
*Sunday, April 1, 2012 at 8:47pm*

**trig**

Give the following for the function: y=2+cos(5x+3.14 Amplitude: Period: Phase Shift:
*Sunday, April 1, 2012 at 7:29pm*

**Trig**

A 7.25 inch circular saw blade rotates at 5200 revolutions per minute. a) Find the angular speed of the saw blade in radians per minute. b) Find the linear speed in feet per minute of one of the 24 cutting teeth as they contact the wood being cut.
*Sunday, April 1, 2012 at 6:20pm*

**Trig**

A carousel with a 50-foot diameter makes 4 revolutions per minute. a) Find the angular speed of the carousel in radians per minute. b) Find the linear speed in feet per minute of the platform rim of the carousel.
*Sunday, April 1, 2012 at 6:19pm*

**Trig.**

Josh kicks a soccer ball with an initial velocity of 18 feet per second out of a window from a height of 12 feet. The function h(t)= -16t^2+18t+12 represents the height of the soccer ball after t seconds.What is the domain of this function in the context of this problem?
*Sunday, April 1, 2012 at 2:17pm*

**Trig**

Why does 11.4(7pi/18)=133pi/30 ?
*Sunday, April 1, 2012 at 12:12pm*

**Trig **

Solve the equation 2sin(2x) = cos x. and Solve the equation cos^2(2x)–sin^2(2x)= (√3 / 2).
*Sunday, April 1, 2012 at 1:13am*

**Trig**

Use the half-angle formulas to come up with an exact expression for each function value below. You do not have to simplify your answers. cos(pi/16)
*Sunday, April 1, 2012 at 1:09am*

**Trig Circular Motion**

A es004-1.jpginch circular saw blade rotates at 5200 revolutions per minute. a) Find the angular speed of the saw blade in radians per minute. b) Find the linear speed in feet per minute of one of the 24 cutting teeth as they contact the wood being cut.
*Saturday, March 31, 2012 at 4:45pm*

**Trig**

A ferris wheel at the fair has a radius of 60 feet. If it takes 24 seconds to make a full revolution, what is the linear speed for the passengers?
*Saturday, March 31, 2012 at 4:44pm*

**trig**

2sin^2x-1=0[0,2pi)
*Thursday, March 29, 2012 at 10:59am*

**Geom./Trig.**

an airplane flies directly overhead at 540mph. 1 minute later is seen at an angle of elevation of 34 degrees. how far did the airplane fly during that time? what is the elevation of the plane?
*Wednesday, March 28, 2012 at 5:20pm*

**TRIG**

IF Y=5+7C0S 4(0-7). FIND YWHEN 0=42 DEGREES. SMALLEST POSITIVE VALUE OF 0 FOR WHICH Y=1.5
*Wednesday, March 28, 2012 at 11:58am*

**trig**

Two tracking stations are on the equator 134 miles apart. A weather balloon is located on a bearing of N 38°E from the western station and on a bearing of N 19°E from the eastern station. How far is the balloon from the western station? Round to the nearest mile.
*Wednesday, March 28, 2012 at 11:26am*

**trig**

Find the other endpoint of the line segment with the given endpoint and mid point. 1. Endpoint:(-1, 9), midpoint: (-9, -10) 2. Endpoint: (2, 5), midpoint: (5, 1) 3. Endpoint:(9, -10), midpoint: (4, 8)
*Wednesday, March 28, 2012 at 9:49am*

**trig**

prove: cot^2(x)=cos(x)/(sinx)(tanx)
*Monday, March 26, 2012 at 9:26pm*

**algebra-trig help asap**

An isosceles triangle has a base 22 cm long and a base angle of 72 degrees. Find its perimeter.
*Monday, March 26, 2012 at 7:50pm*

**trig**

prove: (tan x + sec x)^2 = 2sec^2 x + 2tan x sec x - 1
*Monday, March 26, 2012 at 11:20am*

**trig**

prove: (tan x + sec x)^2 = 2sec^2 x + 2tan x sec x - 1
*Monday, March 26, 2012 at 11:10am*

**trig**

How do I prove : 4sinAcosAcos2Asin15 all over. :sin2A(tan225-2sinsquared A)is equal to. :root 6 - root 2 over 2
*Monday, March 26, 2012 at 7:44am*

**trig**

Prove: sin(x–y)sin(x+y)=sin^2(x)–sin^2(y)
*Monday, March 26, 2012 at 1:09am*

**calculus**

need help simplifying some trig identities such as: (csc t) (sin t) cos t = 0.75 and tan t = 0.88, find sec t and cot t; (cot2t) (sin2t) + sin2 t; csc2t - cot2t/sin2t
*Sunday, March 25, 2012 at 9:15pm*

**trig**

Prove: (tan x+sec x)^2 = 2sec^2(x)+2tan(x)secx-1
*Saturday, March 24, 2012 at 5:10pm*

**trig**

Prove (cscx+cotx)(cscx-cotx)=1
*Saturday, March 24, 2012 at 4:10pm*

**Trig**

Prove: (cotx sinx)(secx-cosx)=sin^2(X)
*Saturday, March 24, 2012 at 3:03pm*

**trig**

What is cosx=1/2?
*Thursday, March 22, 2012 at 3:43pm*

**Trig **

As you ride a ferris wheel, your distance from the ground varies sinusoidally with time. When the last passenger boards the ferris wheel and the ride starts moving, let your position be modeled by the diagram provided. Let t be the number of seconds that have elapsed since ...
*Thursday, March 22, 2012 at 12:43pm*

**trig**

Solve for theta, giving a general formula for all of the solution: tan(theta)=-1 sin(theta/2)=1/2
*Thursday, March 22, 2012 at 12:28pm*

**Trig**

4sin^(2)x-3=0
*Wednesday, March 21, 2012 at 9:08pm*

**Trig **

cos(3x)=-1
*Wednesday, March 21, 2012 at 9:02pm*

**Trig**

Solve Sinx=Cos2x-1 for all values between 0 and 2pi
*Wednesday, March 21, 2012 at 4:34pm*

**trig**

Determine the least positive value of t for which d=0. d=cos((3pi/4)(t)) 0=cos((3pi/4)(t)) I got stuck on this step Please help
*Wednesday, March 21, 2012 at 12:57am*

**trig**

Determine the least positive value of t for which d=0. d=cos((3pi/4)(t)) 0=cos((3pi/4)(t)) I got stuck on this step Please help
*Wednesday, March 21, 2012 at 12:57am*

**trig**

If theta is a standard position angle and cot theta = 1.85, in which quadrant(s) could theta lie?
*Tuesday, March 20, 2012 at 3:50pm*

**trig**

if tan(θ)=√(33) / 4 (√ does not ride over 4) find sin(θ)<0 i would just like to know the steps of how to do it.
*Tuesday, March 20, 2012 at 3:33pm*

**trig**

What would be the force required to push a 100-pound object along a ramp that is inclined 10 degrees with the horizontal?
*Monday, March 19, 2012 at 7:08pm*

**trig**

if sin theta equals 3/7, what is tan theta?
*Monday, March 19, 2012 at 4:12pm*

**trig**

howard and keight who are 2km apart are on a horizontal plane observe a balloon in the same vertical plane with themselves the angles of elevation are 50 degrees and 65 degrees respectively find the height of the balloon. A.if its situated between howard and keight B.If it is ...
*Monday, March 19, 2012 at 7:03am*

**trig**

verify that 2/1+cos theta - tan squared (theta/2) = 1
*Monday, March 19, 2012 at 12:09am*

**trig e-maths**

giving that cosx=4/5 and siny=12/13, find cos(x+y) when x is acute and y is obtuse angle
*Sunday, March 18, 2012 at 9:58am*

**trig**

a plane takes off at 10.00am from an airfield, and flies at 120km/h on a bearing of N35W. A second plane takes off at 10.05am from the same airfield, and flies on a bearing of S80E at a speed of 90km/h. How far apart are the planes at 10.25am?
*Sunday, March 18, 2012 at 7:29am*

**trig**

Find the general solution for x if cos2x + sin3x = sinx
*Sunday, March 18, 2012 at 5:22am*

**inverse trig HELP PLEASE!!**

Write the general solution to y = arcsin (0.6428). 40°±360°k 140°±360°k 220°±360°k 320°±360°k How do I find the right answer? I am like seriously stuck. I need help please.
*Sunday, March 18, 2012 at 12:12am*

**trig**

In a computer simulation, a satellite orbits around Earth at a distance from the Earth's surface of 2.1 X 104 miles. The orbit is circular, and one revolution around Earth takes 10.5 days. Assuming the radius of the Earth is 3960 miles, find the linear speed (velocity) of ...
*Saturday, March 17, 2012 at 10:59pm*

**trig**

solve for theta 6. tan theta=-1 7. sin(theta/2)=1/2 thank you for your help!
*Saturday, March 17, 2012 at 6:00pm*

**trig**

when sin theta+cos theta=square root of 2,find the solution of sin^3 theta+cos^3 theta
*Saturday, March 17, 2012 at 3:51pm*

**Algebra-Trig help asap**

A rhombus has sides of 5 cm each and one diagonal is 6 cm long. Find the area of the rhombus.
*Tuesday, March 13, 2012 at 5:37pm*

**Math:Trig.!!!! **

You (safely) bungee jump from a 200-feet tall bridge in your town. Your distance above the water's surface depends on the time since you jumped. Sketch a reasonable graph.
*Monday, March 12, 2012 at 10:02pm*

**trig**

solve the equation 2 tan C-3=3 tan X-4 algebraically for all values of C in the interval odegrees lessthan or equal C lessthan360 degrees.
*Monday, March 12, 2012 at 9:20pm*

**Trig-Algebra help asap**

A regular octagon is inscribed in a circle with a radius of 5 cm. Find the area of the octagon.
*Monday, March 12, 2012 at 8:50pm*

**Trig-Algebra help asap**

A regular pentagon is inscribed in a circle whose radius measures 7 cm. Find the area of the pentagon.
*Monday, March 12, 2012 at 8:49pm*

**Trig-Algebra help asap**

A rhombus has sides of 5 cm and one diagonal is 6 cm long. Find the area of the rhombus.
*Monday, March 12, 2012 at 8:17pm*

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