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February 1, 2015

February 1, 2015

**Recent Homework Questions About Trigonometry**

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**trig**

Write the expression and evaluate. There is only one answer whIch should match the range of the inverse trig function. Sec^-1(-2) I got 2pi/3 could someone tell me if that is right? And if not, could someone please explain how to get the answer.
*Monday, September 5, 2011 at 7:27pm*

**Pre-Calculus/Trig Check please and help**

Could someone please check the first one and help me with the second one. I'm stuck-Thank you 1.What are theroots of the following polynomial equation? (x+2i)(x-5)(x-2i)(x+8) = 0 I think the roots are -2i,5,2i,-8-you take out the roots as opposites of what are in the ...
*Monday, September 5, 2011 at 8:52am*

**Trig**

Use linear velocity to find out how many miles per hour Jethro's truck is going. In 15 seconds, Jethro's truck's 24-inch diameter tires rotated 101 times.
*Sunday, September 4, 2011 at 7:03pm*

**trig**

cos(arccsc(-20)) Im not allowed to have a decimal answer
*Sunday, September 4, 2011 at 9:57am*

**trig**

Write the expression and evaluate. There is only one answer whIch should match the range of the inverse trig function. Sec^-1(-2) Sec^-1(-sqrt2) Tan^-1(-sqrt3) Tan^-1(sqrt3)
*Saturday, September 3, 2011 at 4:46pm*

**trig**

Write the expression and evaluate. There should only be one answer which should match the range of the inverse trig function. Sec^-1(-2) sec^-1(-sqrt2) Cos^-1((-sqrt3)/2) Tan^-1(-sqrt3) Could someone explain how to get the answer as well please.
*Saturday, September 3, 2011 at 3:57pm*

**trig**

If sin T = 1/2, then the value of sinT ( sinT - cosecT ) is
*Saturday, September 3, 2011 at 8:26am*

**trig**

how would i graph 3sec(x + (pi/2))
*Friday, September 2, 2011 at 10:21pm*

**Trig**

Find the exact value of each of the following using reference angles. a)sin 225degrees b) cot 120degrees
*Friday, September 2, 2011 at 8:43pm*

**trig**

Derive the identity 1 + cot ^2 theta = csc^2 theta by dividing x^2 + y^2 = r^2 by y^2
*Thursday, September 1, 2011 at 10:27pm*

**trig**

if cos(theta) equal -3/4 find sin(2theta)
*Thursday, September 1, 2011 at 9:29pm*

**Trig**

find the exact values of the six trig functions of angle... sin(-315degrees) how do i do this?
*Thursday, September 1, 2011 at 9:16pm*

**trig**

a propeller turns at 300 rpm. Find the angular speed in rad/sec and the linear speed at the tip if the tip to the center is 30cm
*Thursday, September 1, 2011 at 12:35pm*

**Trig**

assume A= alpha using complementary rule how do I solve for alpha? cos(2A+40) =sin(3A-60) I don't understand how to start the question. What are the steps in solving for alpha. Do i get cos to equal sin somehow?
*Thursday, September 1, 2011 at 2:11am*

**trig**

find the next two positive and negative angles coterminal with the quadrantal angle. 90 degrees. would the answer be..... would it be 450, 810?????? and -630, -270 ????
*Monday, August 29, 2011 at 2:48am*

**Trig**

cos270degrees -5cos180degrees (0/1)-5(-1/1) 0-5(-1) does it equal -5 or +5?
*Monday, August 29, 2011 at 2:29am*

**Trig**

Find the angle of the measure formed by the clock. 2:15
*Monday, August 29, 2011 at 1:21am*

**Trig**

A soccer goal is 24 feet wide. Point A is 40 feet in front of the center of the goal. Point B is 40 feet in front of the right goal post. Which angle is larger A or B? How much larger?
*Sunday, August 28, 2011 at 2:39pm*

**trig**

5sin^2 270degrees -3cos180degrees-tan(-180degrees) i got -2 but I'm not sure if i did it right?
*Sunday, August 28, 2011 at 6:43am*

**trig**

Suppose that 0degrees<theta<180degrees. what is the sign of each of the following? a) cos theta/2 b)sin(-theta)
*Sunday, August 28, 2011 at 5:47am*

**trig**

Use the appropriate identity to find tan(theta) given that cot theta =0.05.
*Friday, August 26, 2011 at 11:15pm*

**trig**

Use trigonometric identities to find sec theta, given that tan theta = Radical 5/ 3.
*Friday, August 26, 2011 at 7:45pm*

**trig**

Suppose that 0degrees<theta<180degrees. what is the sign of each of the following? a) cos theta/2 b)sin(-theta)
*Friday, August 26, 2011 at 7:43pm*

**trig**

If a, b are the solutions of the equation log base 3 (5-2x)+ log base 3 (5+2x)=2 find the value of the product ab.
*Friday, August 26, 2011 at 3:29pm*

**trig**

find the value of x when: x= 5 log base 2 (1/16)+ 8 log base 3 (27)
*Friday, August 26, 2011 at 3:15pm*

**trig**

use trig identities to rewrite: (1/(1-cos4v))-(1/(1+cos4v))
*Friday, August 26, 2011 at 12:31am*

**calculus**

Find two unit vectors that make an angle of 60° with v = ‹3, 4›. Give your answers correct to three decimal places. I'm not sure what to do here; I believe that I use to definition of a dot product (or maybe cross product) with relation to the trig function (...
*Wednesday, August 24, 2011 at 10:45am*

**trig**

what is the reference angle for 17 pi/12?
*Tuesday, August 23, 2011 at 11:22pm*

**Trig**

Find values of all six trig functions if sin(theta)= 4/5 and theta is in the second quadrant.
*Tuesday, August 23, 2011 at 2:47pm*

**trig**

cos@-4SIN@=1 then sin@+4cos@=
*Sunday, August 21, 2011 at 11:25am*

**trig**

If 2tanA+cot A=tan B, then prove that 2tan(B-A)=cot A
*Sunday, August 21, 2011 at 1:08am*

**trig**

A ferris wheel with a diameter of 100 feet rotates at a constant rate of 4 revolutions per minute. Let the center of the ferris wheel be at the origin. 1. Each of the ferris wheel's cars travels around a cirlce. a) Write an equation of the circle where x and y are measured...
*Saturday, August 20, 2011 at 4:21pm*

**trig**

(sec theta + cosec theta) (sin theta +cos theta) = 2 + sec theta cosec theta
*Saturday, August 20, 2011 at 4:32am*

**trig**

a plane is flying with airspeed of 140 mph and heading 280 degrees. The wind currents are running at 20mph at 260 degrees clockwise from due north. Find the true course and ground speed of the plane.
*Friday, August 19, 2011 at 1:13pm*

**trig**

sina=^10 sinb=^5 find a+b if a,b are acute angles
*Friday, August 19, 2011 at 12:33pm*

**trig**

sina=^10 sinb=^5 find a+b if a,b are acute angles
*Friday, August 19, 2011 at 12:30pm*

**trig**

how do you find all the values of theta from 0 degrees through 360 degrees for which sin theta equals 0
*Thursday, August 18, 2011 at 9:37pm*

**trig**

i can not figure out how to write the complex number in rectangular form the question is 4(cos 5Pie/6 + i sin 5 pie/6)
*Wednesday, August 17, 2011 at 9:57pm*

**Trig**

Find the polar coordinates of (8, –8) for r ≥ 0. I am getting 8 square root of 2 as the first coordinate. I am not sure if I am finding the arctan correctly.
*Monday, August 15, 2011 at 10:52pm*

**trig and cotagent**

Evaluate cot(11pi/6) to the nearest hundredth (given in radians).
*Monday, August 15, 2011 at 12:38am*

**trig**

Solve the equation for cos theta-tan theta=0 for greater than or egual to zero but less than 2pi. Write your answer as a multiple of pi, if possible form the following choices: pi , 5pi A. --- ---- 4___ 4 B. pi 3pi 5pi 7pi ----- '----- '-----'----- 4_____ 4_____ ...
*Monday, August 15, 2011 at 12:32am*

**trig**

Solve the equation for cos(3theta/2).tan(3theta/2)for greater than or egual to zero but less than 2pi. Write your answer as a multiple of pi.
*Monday, August 15, 2011 at 12:29am*

**trig**

sin2xcosx-sinx=0 interval(0,2pi)
*Sunday, August 14, 2011 at 3:07pm*

**trig**

Find the smallest positive value of x(in degree) for which tan(x+100°)=tan(x+50°)*tanx*tan(x-50°)
*Saturday, August 13, 2011 at 11:38am*

**trig**

A tower is supported by a guy wire from the top of the tower to the ground 16 ft from its base. The wire makes an angle of 62 with the ground. The length of the wire is a. 30.09 ft b. 18.12 ft c. 28.41 ft d. 34.08 ft
*Friday, August 12, 2011 at 1:54pm*

**Trig/pre-calc**

r=8cos(theta)+5sin(theta), convert the polar equation into a rectangular equation and then complete the square and determine the center radius...? Help?! I missed the section, and am not getting anywhere with the text...
*Friday, August 12, 2011 at 7:21am*

**trig**

Find sin(2theta) if tan of theta = 7/24, pi < theta < 3pi/2 ?
*Tuesday, August 9, 2011 at 11:03pm*

**trig**

If z=1+i, then the multiplicative inverse of z esqaire is:
*Monday, August 8, 2011 at 5:18am*

**trig**

Find sec theta if theta=3/4 in Q1
*Sunday, August 7, 2011 at 11:23pm*

**Pre-calculus**

find the trig functions of angle x if the terminal side of x passes through the point (-12, 5).
*Sunday, August 7, 2011 at 10:35pm*

**Precalculus**

How would you solve this trig function: cos2x=sin^2-2 how do you know what trig identities to use?
*Saturday, August 6, 2011 at 5:39pm*

**Geometry**

30-60-90 triangle has a hypoteneuse of 10 use trig to find the short side
*Wednesday, August 3, 2011 at 9:58am*

**Math**

What are some examples of exponential function (Using the formula: Al = A0(1/2)^t/h ), trig functions that are used to find amplitude, period, max, min etc., and combinations of transformation at home or in life in general?
*Saturday, July 30, 2011 at 7:45pm*

**trig**

An arc subtends an angle 15 degrees at the centre of the circle. If the radius is 4 centimetres, find the area of the sector?
*Friday, July 29, 2011 at 10:18pm*

**Trig**

A car is traveling at a speed of 55 mph with a bearing of 210°. What vector represents the velocity?
*Thursday, July 28, 2011 at 10:24pm*

**Pr-Cal/Trig**

1)if the graph of f(x)=cotx is transformed by a horizontal shrink of 1/4 and a horizontal shift left pi, the result is the graph of: a) g(x)= cot[1/4(x-pi)] b) g(x)=cot[1/4(x+pi)] c) g(x)=cot[4(x-pi)] d) g(x)=cot[4(x+pi)] e) g(x)=cot[4x+pi] please include how you got the answer
*Monday, July 25, 2011 at 5:51pm*

**Trig**

Find [4(cos115+isin115)]^6
*Monday, July 25, 2011 at 3:27pm*

**pre calculus 2**

use the fundamental trig. Identities to simplify tan^4x+2tan^2x+1
*Sunday, July 24, 2011 at 9:18pm*

**math**

mr. pursley, have you ever worked geo., trig. etcwith no calu.s with the heat on , when it had to be right?wheather you blew up your target or something else or the bld. collapsed or was built in the correct place? i'm not an answer grazer, but qam an answer seeker.I'm...
*Friday, July 22, 2011 at 8:27pm*

**Trig: Conics**

Sketch the graph and find following info: Vertex: Focus: Directrix: Axis of Symmetry: Ends of Latus Rectum: (x-2)^2=4(y-3) I think the vertex is (2,3) is this correct, and how do I proceed on? Thank you!
*Wednesday, July 20, 2011 at 1:47pm*

**Trig**

Find an equation for the hyperbola described. Foci at (-4,0) and (4,0); asymptote the line y= -x. Please explain the steps of this problem. My book does not get an example of this type of problem and I'm not having any luck working this problem.
*Tuesday, July 19, 2011 at 11:08pm*

**Trig**

A bridge is built in the shape of a parabolic arch. The bridge has a span of s= 160 feet and a maximum height of h= 25 feet. Choose a suitable rectangular coordinate system and find the height of the arch at distances of 10, 30, and 50 feet from the center. 10= 30= 50=
*Monday, July 18, 2011 at 9:16am*

**trig**

Find the exact value of the trigonometic function at the given real number of cot(5pi/3)
*Sunday, July 17, 2011 at 10:22pm*

**Trig math**

How do I solve for x? cos(4x)(2+tan^2x)=8
*Thursday, July 14, 2011 at 5:56pm*

**trig**

How do i solve Cos (4x)(2+tan^2X0 = 8?
*Thursday, July 14, 2011 at 5:53pm*

**trig**

Given that SIN Theta = -1/sqrt(10) and theta is in quadrant 4, find sin2theta and cos2theta. I'm not sure how to properly square the -1/sqrt10 and keep an exact answer other than decimal. Otherwise, my final answer is Sin2Theta = -.7255970691 and cos2theta = 1.632455533
*Wednesday, July 13, 2011 at 4:10pm*

**trig**

An airplane has an airspeed of 450 km/hr bearing N45E. The wind velocity is 30 km/hr in the direction N30W. What is the ground speed and what is its direction?. I have gotten this far: A= 450cos(45), 450sin(45) = (318.20, 318.20) W= 30cos(120), 30sin(120) = (-15, 25.98) A+W= ...
*Wednesday, July 13, 2011 at 1:25pm*

**trig**

Verify that each trigonometric equation is an identity tan^2+1/sec Î± =sec Î±
*Wednesday, July 13, 2011 at 8:15am*

**trig**

During a 12-hour period, the tides in one area of the Bay of Fundy cause the water level to rise to 6 m above average sea level and to fall 6 m below average sea level. The depth of the water at low tide is 2 m as measured against a pier. a.) Suppose the water is at average ...
*Wednesday, July 13, 2011 at 12:18am*

**trig question...**

During a 12-hour period, the tides in one area of the Bay of Fundy cause the water level to rise to 6 m above average sea level and to fall 6 m below average sea level. The depth of the water at low tide is 2 m as measured against a pier. a.) Suppose the water is at average ...
*Tuesday, July 12, 2011 at 1:41pm*

**Math-trig.**

1)sinx+cosx=1 2)sinx+cosx=1+sin2x
*Friday, July 8, 2011 at 6:57am*

**trig**

find cos (x/2) when sint =12/13
*Thursday, July 7, 2011 at 11:11pm*

**trig**

1=2pi times the square root of (L/9.8)
*Wednesday, July 6, 2011 at 11:21pm*

**trig**

sin^2(3 theta+5pie)+cos^2(3 theta+5pie)= ?
*Wednesday, July 6, 2011 at 5:22pm*

**trig**

N 5 22x2 1 76x 1 430 Use the equation to find N for each year in the table. (b) Discuss how well this equation approximates the data. (c) Rewrite the equation with the right side completely factored. (d) Use your equation from part (c) to find N for each year in the table. Do ...
*Friday, July 1, 2011 at 9:15pm*

**trig**

An airplane flying at 600 miles per hour has a bearing of 152 degrees. After flying for 1.5 hours, how far north and how far east will the plane have traveled from point of departure?
*Thursday, June 30, 2011 at 9:09pm*

**trig**

Evaluate the expression cos 22 degrees and sec 22 degrees
*Thursday, June 30, 2011 at 11:25am*

**trig **

A 115 foot foot casts a 147 foot shadow, what is the degree of elevation to the sun
*Tuesday, June 28, 2011 at 10:23pm*

**trig**

y=7sin20degrees/5
*Monday, June 27, 2011 at 11:15pm*

**Trig**

A plane is flying at 240 mph heading North 60 degrees East. The wind is blowing at South 30 degrees East at 30 mph. What is the largest and smallest angles?
*Saturday, June 25, 2011 at 2:59pm*

**trig**

sinx+sinxcot^2x=cscx prove each identity
*Friday, June 24, 2011 at 11:02am*

**trig**

tan(theta)-1= sin^2(theta)-cos^2(theta)/ sin(theta)cos(theta)+cos^2(theta) prove each identity
*Friday, June 24, 2011 at 11:01am*

**Algebra/Trig**

The members of a men’s club have a choice of wearing black or red vests to their club meetings. A study done over a period of many years determined that the percentage of black vests worn is 60%. If there are 10 men at a club meeting on a given night, what is the ...
*Monday, June 20, 2011 at 6:18pm*

**trig**

the angle in one regular polygon is to that in another as 3:2 and the number of the sides in first is twice that in second determine the the number of sides of 2 polygons
*Sunday, June 19, 2011 at 3:10am*

**Trig**

The graph of y = 7cosx + 24sinx would be a sinusoid if it were plotted. What would be the first positive value of x at which there is a high point?
*Friday, June 17, 2011 at 1:15pm*

**trig**

1. if sin 2A = Psin2B, prove that tan(A+B)/tan(A-B)=P+1/P-1.
*Tuesday, June 14, 2011 at 5:17am*

**trig**

Why are the quadrants situated and numbered the way they are.What is the purpose.
*Monday, June 13, 2011 at 8:08pm*

**trig**

how high is a tree that casts a 30 ft shadow at the same time a 10 ft pole casts a shadow which is 10 ft long?
*Sunday, June 12, 2011 at 10:53pm*

**Trig**

Find the amplitude, period, and phase shift of the following function: y=-2cos2(θ+45)
*Saturday, June 11, 2011 at 3:58pm*

**Trig**

URGENT, Please answer this question: give the value of: Tan(Arctan x+1/x-1+Arctan x-1/x)
*Saturday, June 11, 2011 at 10:21am*

**trig**

if alpha and beta are 2 different values of θ lying between 0 and 2π which satisfy the equation 6cosθ+8 sinθ=9 find the value of sin alpha + beta
*Saturday, June 11, 2011 at 6:54am*

**TRIG..............**

Q.1 Prove the following identities:- (i) tan^3x/1+tan^2x + cot^3x/1+cot^2 = 1-2sin^x cos^x/sinx cosx (ii) (1+cotx+tanx)(sinx-cosx)/sec^3x-cosec^3x = sin^2xcos^2x.
*Friday, June 10, 2011 at 7:18am*

**Trig**

give the value of tan(arctan x+1/x-1+arctanx-1/x)
*Thursday, June 9, 2011 at 9:58pm*

**aleg/trig**

two forces of 14and 30 act on a body forming an obtuse angle w/ eachother. if the resultant is 60, whats the angle betweeen the 2 forces?
*Thursday, June 9, 2011 at 9:15pm*

**alegbra/trig**

x^2+2x-15=0 solve by completing the square
*Thursday, June 9, 2011 at 9:13pm*

**Math - Trig**

Let Vector V(t) = 2pi t î + 2pi t ĵ. Find the vector V(1/3). Where is the vector after the next 1/3s? What is the angular speed?
*Thursday, June 9, 2011 at 2:33am*

**algebra/trig**

1.Find the domain f(x)=ã(x^(2)-9) 2. Find all six trig functions for (-3,4)
*Wednesday, June 8, 2011 at 11:27pm*

**trig**

I get that we have to put it into radical form, but I don't understand the process. Can someone walk me through it and explain it? arccos(-1/2)
*Tuesday, June 7, 2011 at 4:26pm*

**trig**

FInd the exact value pf the 6 trig function of alpha Given: point (-2,-6) on the terminal side of the angle in standard position sin alpha cos alpha tan alpha sec alpha csc alpha cot alpha
*Tuesday, June 7, 2011 at 10:26am*

**Trig**

Evaluate (if possible) the sine,cosine, and tangent of the angle 10pi/3
*Monday, June 6, 2011 at 4:58pm*

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