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August 29, 2015

Homework Help: Math: Trigonometry

Recent Homework Questions About Trigonometry

trig
find an angle between 0 and & 2 pi that is coterminal with - 11 over 24 pi
Tuesday, May 31, 2011 by Sage

Trig
How do I prove the following Identity? sec x(sec x-cos x)=tan^2x If there is a certain website or suggestion to help with these type of equations I would greatly appreciate it. I've been studying these for a while but still get pretty confused.
Tuesday, May 31, 2011 by Mel

trig
Simplify: cos x cos x ----- + ----- sec x-1 sec x+1
Tuesday, May 31, 2011 by Anonymous

trig
verifying a solution. 4cos^2 2x-2=0
Tuesday, May 31, 2011 by tomas

trig
how much force is necessary to stop a 2500 pound car from rolling down a 40degree slope
Monday, May 30, 2011 by Anonymous

trig
If cos(t)=(-7/8) where pi<t<(3pi/2), find the values of the following trig functions. cos(2t)=? sin(2t)=? cos(t/2)=? sin(t/2)=?
Monday, May 30, 2011 by Char

trig
prove as an identity 1/1+sin(x) + 1/1-sin(x)
Monday, May 30, 2011 by mel

trig
Ok, so im brand new at trigonometry. If i have a right triangle with an acute angle of 30° an opposite side of 4 and a hypotenuse of x how do ii find x
Monday, May 30, 2011 by maya

trig
y = sin (3x-2pi)
Monday, May 30, 2011 by mike

trig
sec(90degrees -theta)
Friday, May 27, 2011 by john

trig
find the exact zeros of the function in the interval [0, 2π) 2 cot squared x + 3 csc x=0
Friday, May 27, 2011 by shinel

pre cal\trig
Find the following cot(Arccsc 25/24) show your work
Thursday, May 26, 2011 by Cheryl

trig
A plane is flying 225 mph heading South 25°West. The wind is blowing South 80°East at 60 mph. What is the bearing of the plane? What is the smallest angle of the triangle? What is the largest angle of the triangle? What is the remaining angle of the triangle? What is ...
Thursday, May 26, 2011 by Anonymous

trig
if x and y are positive acute angles, tan x=1/3and tan y =1/4, find the value of sin(x-y)
Wednesday, May 25, 2011 by Anonymous

trig
A 2000 pound car is parked on a street that makes an angle of 12* with the horizontal (think it's a street on a hill). a) find the magnitude of the force required to keep the car from rolling down the hill. b) Find the force perpendicular to the street.
Wednesday, May 25, 2011 by ale

trig
An aifplane is flying on a compass heading (bearing) of 170* at 460 mph. A wind is blowing with the bearing 200* at 80mph. a) Find the component form of the velocity of the airplane. b) Find the actual ground speed and direction of the airplane.
Wednesday, May 25, 2011 by ale

trig
A plane is is flying 240 mph heading N60°E. The wind is blowing S30°E at 30 mph. What is ground speed? What is the smallest angle in the triangle? What is the biggest angle in the triangle? What is the remaining angle in the triangle? What is the bearing of the plane?
Wednesday, May 25, 2011 by Anonymous

trig
Find the solutions to the equation cos2x=sinx and 2cos^2x-3cosx-3=0
Tuesday, May 24, 2011 by Jill

Trig
How to find all solutions for 3tan^22x-1=0?
Tuesday, May 24, 2011 by Jill

Trig
find cos x/2, sin x = 1/4, 360 < x < 450, use half-angle identity
Monday, May 23, 2011 by Onedope

trig
find the least positive value of @. sec (4@+10)cos(3@+17) @=theta
Monday, May 23, 2011 by Catherine

trig
In Rights Triangle ABC with C=90 degrees if a=4 and c=2square roots of 7, find SinA
Sunday, May 22, 2011 by Tori

trig
In Rights Triangle ABC with C=90 degrees if a=4 and c=2square roots of 7, find SinA
Sunday, May 22, 2011 by Tori

trig
How do I name the quadrand in which angle thada may lie if sec thada > 0 and tan thada > 0?
Sunday, May 22, 2011 by Nathan

Trig
How do I find the quadrant in which angle thada may lie if cos thada > 0 and tan thada < 0?
Sunday, May 22, 2011 by Nathan

Trig
cos4x*cos3x + sin4x*sin3x
Sunday, May 22, 2011 by Daniel

Trig
A boat heads S 15 degrees E on a river that flows due west. the boat travels S 11 degrees W with a speed of 25 km per hour. Find the speed of the current and the speed of the still water. This is due tomorrow.
Sunday, May 22, 2011 by GoMeGo

trig
In triangle XYZ, angle X = 90°, angle Y = 38°, and z = 4'5". Find y
Friday, May 20, 2011 by pat

Trig
A tree is growing at an angle out of the ground, 15°17' from vertical. Standing 10 feet away from the base, the angle to the top of the tree is 25°17'. What is the length of the tree?
Friday, May 20, 2011 by Anonymous

trig
if A+B=45 degree show that (cos A-1)(cotB-1)=2.
Thursday, May 19, 2011 by mukesh

trig
Find the angle between 0 and 2pi that is coterminal with negative one half pi; expressing the answer in radians in terms of pi.
Thursday, May 19, 2011 by Jay

Trig/Pre-Calc
The demand equation for a microwave oven is given by: p=500-0.5(e^0.004x) Find the demand x for a price of (a) p=$600 and (b) p=$300 Any help would be greatly appreciated.
Tuesday, May 17, 2011 by Annonymous

trig
csc^2x secx/sec^2x+csc^2x
Tuesday, May 17, 2011 by EJ

Trig/Pre-Calc
$2500 is invested in an account at interest rate r, compounded continuously. Find the time required for the amount to (a) double and (b) triple. r=0.085 I know you use the formula A=Pe^rt and you would start by setting it up as follows: A=(2500)e^(0.085)(t) I'm not sure ...
Tuesday, May 17, 2011 by Bradley

trig
Use a graph of the cosecant function to find the value of theta for which csc theta equals 1.
Tuesday, May 17, 2011 by Amanda

Trig/Pre-Calc
Could someone please help me on this problem. I'm really confused, and this assignment is due tomorrow. Solve the logarithmic equation algebraically. Approximate the result to three decimal places. log4x-log4(x-1)=1/2 To start off the equation, I know you would do the ...
Monday, May 16, 2011 by Eric

Trig/Pre-Calc
Need help with current Trig problem for tomorrow: Solve the logarithmic equation algebraically. Approximate the result to three decimal places. 6log3(0.5x)=11 I know to start off the equation you divide by 6. I know the answer is 14.988. I just am puzzled on how to receive the...
Monday, May 16, 2011 by Eric

trig
How do you solve csc2x + 1 = 0
Monday, May 16, 2011 by Jill

trig
Find the exact value of Cos(sin-1ã(3/2))
Monday, May 16, 2011 by Theri

trig
Given that sin (pi/10)=(sqrt(5)-1)/4, use double-angle formulas to find an exact expression for sin(pi/5).
Monday, May 16, 2011 by Victoria

trig
what are the values of theta in the interval 0 degrees is lessthan or equal to theta is less than or equal to 360 degrees that satisfy the equation tan theta minus square root of 3 equals 0?
Sunday, May 15, 2011 by jacquelinemelody

Trig Identities..
Solve any way possibly? Thank you! 1-sin^2x/1-cosx
Sunday, May 15, 2011 by Jill

Trig
A ramp 38' long rises to a platform. The bottom of the platform is 20' from the foot of the ramp. Find x , the angle of elevation of the ramp. Round your answer to the nearest hundredth of a degree. After this question I'm done with TRIG!!! Thanks
Sunday, May 15, 2011 by Rachal

Trig
Consider a triangle ABC like the one below. Suppose that A=45 degress, B=34 degress, and a= 70. Solve the triangle. Round your answers to the nearest tenth.
Sunday, May 15, 2011 by Jennifer

trig
Assume that we know sin(18 degrees)=(sqrt(5)-1)/4, cos(18 degrees)=(sqrt(sqrt(5)+5))/8, find sin(42 degrees) exactly, without using a calculator. Also find cos(42 degrees).
Sunday, May 15, 2011 by Victoria

trig
Evaluate sin(29 degrees)cos(31 degrees) + cos(29 degrees)sin(31 degrees) exactly, without using a calculator.
Sunday, May 15, 2011 by Victoria

Trig
Trig Identity. 1-sin^2x/1-cosx
Sunday, May 15, 2011 by Jill

Trig
Find all solutions of the equation in the interval [0,2pi). sqrt(3)cottheta-1= 0 Write your answer in radians in terms of pi. If there is more than one solution, separate them with commas.
Sunday, May 15, 2011 by Rachal

Algebra 2 / Trig
Given cos X = -0.147, find two possible values for X that are not co-terminal.
Sunday, May 15, 2011 by Ashwin

trig
How do I prove these trig identities? secx-cosx/tanx =sinx And 1+sinx/cosx+ cox/ 1+sinx=2secx
Sunday, May 15, 2011 by Jill

Trig
Find all solutions of the equation in the interval [0,2pi) . cos(theta)=0.7125 If there is more than one solution, separate them with commas. Do not round any intermediate computations, and round your answer(s) to the nearest hundredth. Can someone help me with this? Thanks
Sunday, May 15, 2011 by Rachal

Trig
Rewrite cos(tan^-1(v)) as an algebraic expression in v. Can someone help me with this problem? Thanks
Sunday, May 15, 2011 by Jennifer

Trig
The polynomial function f(x) is defined by f(x)=-4x^4+9x^3+2x^2-7x-2. Use a graphing calculator to find all the points where there is a local minimum. Round to the nearest hundredth.
Sunday, May 15, 2011 by Rachal

Trig
I need help, I don't remember what to do. Find all solutions of the equation in the interval [0,2pi]. (2cosè+sqrt3)(cscè+1)=0 Write your answer in radians in terms of pi. If there is more than one solution, separate them with commas.
Saturday, May 14, 2011 by Rachal

Trig- Check my answer Please
Find the unit vector in the direction of <-1,-2>. Do not approximate any numbers in your answer. I get (-1/sqrt10) and (-3/sqrt10)
Saturday, May 14, 2011 by Rachal

trig
if point P is a point on the terminal side of 0, and 0 is in standard position, find sin 0,cos 0 and tan 0. 1. P(-6,8) 2. P (1,3) 3. P (-2,-40), 4. P (-5, -12)
Saturday, May 14, 2011 by shawn

trig
If cos 0 = - 1/2 and tan 0 > 0, find the quadrant that contains the terminal side of 0, and then find the exact values of the other five trig functions of 0.
Saturday, May 14, 2011 by shawn

trig
if sin 0 > 0 and tan 0 < 0, what quadrant contains the terminal side of 0.
Saturday, May 14, 2011 by shawn

Trig- Check my answer Please
Find the reference angle for -144 degrees. I'm coming up with 504 degrees, but I think I'm missing a step.
Saturday, May 14, 2011 by Rachal

Trig
I need help solving the two problems below. Thanks For each equation, determine whether its graph is symmetric with respect to the -axis, the -axis, and the origin. Check all symmetries that apply. 1. y=-sqrt(4-x^(2)) 2. 34x^(2)+12y^(2)=18
Friday, May 13, 2011 by Rachal

trig
simplify (sec^2x + csc^2x) - (tan^x +cot^2x) to either a constant or a basic trigonometric function.
Friday, May 13, 2011 by toshia

Trig
I need help solving the two problems below. Thanks For each equation, determine whether its graph is symmetric with respect to the -axis, the -axis, and the origin. Check all symmetries that apply. 1. y=-ã(4-x^(2)) 2. 34x^(2)+12y^(2)=18
Friday, May 13, 2011 by Rachal

Trig
How can I find the exact value of Sin 480 degrees? Thanks
Thursday, May 12, 2011 by Rachal

Trig
Let (theta) be an angle in quadrant II such that sec(theta) -4/3 . Find the exact values of cot (theta) and sin (theta).
Wednesday, May 11, 2011 by Johnny

trig
Let be an angle in quadrant II such that sec(theta) -4/3 . Find the exact values of cot (theta) and sin (theta).
Wednesday, May 11, 2011 by Johnny

trig
how do you graph y=-(1/4)sin(3/4x+pi/8? include the amplitude, period, vertical translation, horizontal shift, and table of values please.
Wednesday, May 11, 2011 by amber

Trig- Check my answer Please
Use a cofunction to write an expression equal to csc(4ð/11). Is the answer csc(4ð/11)= 1/sin(4ð/11)
Wednesday, May 11, 2011 by Rachal

Trig
Use a cofunction to write an expression equal to csc(4ð/11). I need help solving this problem. Thank You
Wednesday, May 11, 2011 by Rachal

Trig
Cos(2theta)=-1/2 There are 6 solutions, how do i solve this?
Tuesday, May 10, 2011 by Thanh

trig
Let (theta) be an angle in quadrant II such that csc(theta)=8/5 Find the exact value of tan(theta) and cos(theta).
Tuesday, May 10, 2011 by andy

trig
Let (theta) be an angle in quadrant II such that csc(theta)=8/5 Find the exact value of tan(theta) and cos(theta).
Tuesday, May 10, 2011 by andy

trig
How would you go about finding x and y?? [x-8 2 2y] [9x-16 2 6] [ 2 -7x 7] = [ 2 -7 7] [-4 y-4 2] [-4 -1 2]
Tuesday, May 10, 2011 by carl

Trig
How would you write the partial fraction decomposition of the rational expresion 1/(x^2)-25? I know that you factor the denominator, so that's 1/(x-5)(x+5). What are the next steps?
Tuesday, May 10, 2011 by JD

Trig
Find Theta in the degree measure for the indicated quadrant. Show the diagram. cot (Theta)= -(Radical 3/1)in quadrant IV. I got 240 degrees but i dont know how to do the diagram since 240 degrees is in quadrant III. How do you put this in a diagram?
Tuesday, May 10, 2011 by Lisa

trig
CosA x cos2A + ((sin2A)^2)/2cosA
Tuesday, May 10, 2011 by Makhosini Maluvana

trig question
During a 12- hour period, the tides in one area of the Bay of Fundy causes the water level to rise to 6 m above the average sea level and to fall 6 m below average sea level. The depth of the water at low tide is 2m as measured against a pier. Suppose the water is at average ...
Monday, May 9, 2011 by Mhy

Trig problem
During a 12- hour period, the tides in one area of the Bay of Fundy causes the water level to rise to 6 m above the average sea level and to fall 6 m below average sea level. The depth of the water at low tide is 2m as measured against a pier. Suppose the water is at average ...
Monday, May 9, 2011 by Mhy

trig
find sin if cos(2è)=(4)/(5) and theta terminates in quadrant 1
Monday, May 9, 2011 by Anonymous

trig
How do you solve cos(2arcsin 1/4) using inverse trig. functions??!! PLEASE HELP ME!
Monday, May 9, 2011 by Tor

trig
if sec theta=-5/4 and 180degree < theta< 270degree, find tan theta a.-3/5 b 4/5 c.3/4 d.3/5
Sunday, May 8, 2011 by minh

trig
1st-the reason i keep change my name because some of my friends are using my computer by their own name to asked questions. we are having a hard time solving each trig problems 2nd- if sin theta=0.6 and 90 degree <theta < 180 degree, find the exact value of sin 2 theta. ...
Sunday, May 8, 2011 by minh

trig
Determine the value of cos(theta) given that cos(pi − theta) = .2 (A)p.96 (B) .2 (C) −.2 (D) −sqrt.96 (E) None of the above.
Sunday, May 8, 2011 by Phuong

trig
What is the cotangent of 0 degree? (A) 0 (B) 1 (C) 1/2 (D) −1 (E) None of the above.
Sunday, May 8, 2011 by Phuong

trig
A right triangle has sides of length 5, 12 and 13. What is the sine of the angle opposite the hypotenuse? (A) 1 (B) 5/12 (C) 5/13 (D) 12/13 (E) None of the above.
Sunday, May 8, 2011 by lan

trig
If csc(x) =1/sqrt7 then sec(x) equals (A)p7/7 (B) 6/7 (C)p6/p7 (D)p7 (E) None of the above.
Sunday, May 8, 2011 by lan

trig
The tangent of an acute angle equals 1/2. What is the sine of the angle? (A) 1/p3 (B)p5/2 (C) 2/p5 (D) 1/p5 ( E) None of the above.
Sunday, May 8, 2011 by dat

trig
In a right triangle the hypotenuse has length 10 and the the sum of the cotangents of all three angles of the triangle equals 2. What are the lengths of the other two sides of the triangle? (A) 5 and 5p3 (B) 5p2 and 5p2 (C) 1 and3 p11 (D) 4 and 2p21 (E) None of the above.
Sunday, May 8, 2011 by dat

trig
How many solutions does the equation cos(x) + cos(−x) = 0 have if 0 < x < 2pi? (Radian measure is assumed for x.) (A) infinitely many (B) 1 (C) 2 (D) 3 (E) None of the above.
Sunday, May 8, 2011 by dat

trig
A sine wave function f(x) = a sin(bx) has amplitude 10 and period 40. What are the values of a and b? (A) a = 10 and b = 20/pi ( B) a = 10 and b = 1/40 (C) a = 10 and b = pi/20 (D) a = 10 and b = 40 E) None of the above.
Sunday, May 8, 2011 by dat

trig
use a half angle formula to find the exact value of cos 75 degree
Sunday, May 8, 2011 by lan

trig
Find a numerical value of one trigonometric function of x if secxcotx=4 A.cscx=1/4 b.secx=4 c.secx=1/4 d.cscx=4
Sunday, May 8, 2011 by lan

trig
Find the exact values of the other trig functions of theta given sec theta=7 and sin theta is less than 0.
Sunday, May 8, 2011 by Nick

trig
A triangle T has vertices P, Q and R. The length of the edge between P and Q is 10, and the angles at P and Q are 60degree and 45degree respectively. What is the area of T? (A) 50p3/(1 +p3) (B) 10p3/(1 +p3) (C) 50/(3 + 3p3) (D) 10/(3 + 3p3)(E) None of the above.
Saturday, May 7, 2011 by minh

trig
A triangle T has vertices P, Q and R. The length of the edge between P and Q is 10, and the angles at P and Q are 60degree and 45degree respectively. What is the radian measure of the angle at R? (A) 5pi/24 (B) 5/24 (C) 5pi/12 (D) 5/12 (E) None of the above.
Saturday, May 7, 2011 by minh

trig
Find the numerical value of cos(60degree) + cot(30degree): (A) 1/2 (B) 3p3/2 (C) 12 +p3 (D) 52p3 (E) None of the above.
Saturday, May 7, 2011 by minh

trig
A tree casts a shadow 50 yards long when the angle of the sun (measured from the horizon) is 30 degree. How tall is the tree in feet? (A) 150p3 (B) 50p3 (C) 150 (D) 75p3 (E) None of the above.
Saturday, May 7, 2011 by minh

trig
The hypotenuse of a right triangle has length 8 and one of the other edges has length 3. What is the sine of the angle opposite the edge of length 3? (A) 3/p55 (B) 3/8 (C)p55/8 (D) 55/64 (E) None of the above.
Saturday, May 7, 2011 by minh

trig
Determine the value of cos(theta) given that cos(pi − theta) = .2 (A) p.96 (B) .2 (C) −.2 (D) −p.96 (E) None of the above.
Saturday, May 7, 2011 by minh

trig
Find the sum of all of the solutions to the equation cos(2x) − sin2(x) − 1 = 0 in theinterval 0 < x < 5 pi. (Use radian measure for x.) (A) 15pi (B) 0 (C) pi (D) 10pi (E) None of the above.
Saturday, May 7, 2011 by minh

trig
2. A circle has a radius of 10 centimeters. Find the length, in centimeters, of the arc intercepted by a central angle of 100 degree. (A) 50pi/9 (B) 100pi/9 (C) 500pi/9 (D) 18pi/5 (E) None of the above.
Saturday, May 7, 2011 by minh

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Homework Help: Math

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