Determine A, B and C so that the formula (cosx−5sinx)^2 = A cos2x + B sin2x + C is valid for all values on x. A, B och C are integers.

This is translated from a trigonometry problem in another language, I hope you understand it.

find the exact values of the expressions without solving for x.

If sin(x) = 1/4 and x is in quadrantI,find the exact values of the expressions without solving for x.   (a) sin(2x) (b) cos(2x) (c) tan(2x)

find the exact values of sin(a+b) and cos(a-b)

Given that sin(a)=2/3 and cos(b)=-1/5, with a and b both in the interval of pi - pi/2

Verifying Trig identity

Hello! I am having some trouble verifying a trig identity   sin(4x)=4cos^3(x)sin(x)-4sin^3(x)cos(x)

Find the expression that is equal to (tan(theta)+cot(theta))^2:

a)  tan^2(theta)+cos^2(theta)   b)  2tan(theta)cot(theta)   c)  2cot^2(theta)-1   d)  sec^2(theta)+csc^2(theta)

Trig Question

Prove sec2x-1=sec2xsin2x, justify significant steps. (state identities used)

Trigonometry Proof

Please help me answer the following question! I'm stuck!   Prove that cos6ß + sin6ß = 1/4 + 3/4cos2ß   I've tried simplifying out the LHS into (cos2ß)3 + (sin2ß)3,...

Jul 19 | Caitlyn from Seattle, WA | 2 Answers | 0 Votes

find exact solution for x real in degrees. tan x = -2sinx, 0 ≤ x < 360

This is my work.   tanx = -2sinx sinx/cosx = -2sinx sinx = -2sinxcosx     (multiply by cosx) 1 = -2cosx               (divide...

Jul 11 | Bader from Scottsdale, AZ | 1 Answer | 0 Votes

With reference to the definitions of sinhx and coshx show that: cosh^2 x-sinh^2 x =1

sinh x = (e^x-e^-x/2) and cosh x = (e^x + e^-x/2) 

With Reference to the standard right angle triangle, show that cosec^2 x =1+cot^2 x

Using Pythagoras, and making reference to a right angle triangle.  

Solve the equation giving all values of x which lie between 0 degrees and 360 degrees

1) 2sec x =4.6 2) 3cos^2 x + cos x-2 =0 3) Sech x =0.554

How do you prove sin(4z) = [4tan(z)(1-tan^2(z))]/(1+tan^2(z))^2

Prove sin4z = [4tanz(1-tan2z)]/(1+tan2z)2

Trig Identities

Using angle A=53.13 and angle B=36.87 find an algebraic expression for tan theta =tan (a-B) in terms of x. x= 12 m

Trig Identities

Using angle A=53.13 and angle B=36.87 find an algebraic expression for tan theta =tan (a-B) in terms of x. x= 12 m  

Cosx-1=sinx

verify the trig identity plz help!!!

if sin theta is equal to 3/5 on the interval (pi/2 , pi), what is tan 2 theta?

 if sin theta is equal to 3/5 on the interval (pi/2 , pi), what is tan 2 theta?

How to solve (sinx/1-cscx)-(sinx/1+cscx)= -2cot^2x?

I need to set the problem sides equal to each other. A step-by-step guide would be helpful. My entire class doesn't understand it.

Help with trigonometric proofs. I really need help.

a) (sinx-tanx)/(cosx-cotx)=〖tan〗^2 x((cosx-1)/(sinx-1))   b) (cos^2x-sin^2x)/sinxcotx-cosxtanx)= cosx + sinx   Please show work. Thank you so much!

1.Secy/coty + tany)2.tanycoty)(tany+ coty)3.( Siny + cosy)(secy + cscy)4.tany(cosy - cscy)5.Siny +cosy)(secy +cscy)6.(siny-cosy)^2 9.tan165)10.sin225)12.cos165)

These are multiple questions that I need help with. Numbers 1.( Ask to simplify) 2-6 (ask to multiply and simplify) and 9-14 ask to find angle sum and difference.    Note: I'm also...

(Siny - cosy) (siny + cosy)

I need to simplify using Pythagorean identities I need hel asap