Prove each trigonometric identities.

Prove each trigonometric identities.

tanθcos2θ=(2tanθcos2θ-tanθ/1-tan2θ)

I am doing sum and difference formulas with sin, cos, and tan. I am doing tan75 with the difference formula. So tan 120-45 I have all the things found I just don't know...

prove that sin(45+x).sin(45-x)=1/2cos2x

If cosα=0.173 and cosβ= 0.432 with both angles’ terminal rays in Quadrant-I, find the values of cos(α+β)=? cos(α-β)=? Your answers should be accurate to 4 decimal places. please help...

If cosα=0.891 and cosβ=0.577 with both angles’ terminal rays in Quadrant-I, find the values of tan(α+β) Your answers should be accurate to 4 decimal places. please help, thanks!

I dont quite remember how to solve this, if anyone could help.

During a polar vortex last winter, the temperatures followed a regular pattern each day for a week: the maximum temperature was –4° F each day at 5:00 pm and the minimum temperature each day was –...

How do I rewrite (tanθ+secθ)/cosθ in terms of sinθ? (fully simplified)

Determine the exact value of cos(Pi/24)???

The question is cos -105. I know how to do the process for it but for some reason my answer doesn't have the right negatives. I am getting: √2 + (-√6) -------------- ...

solve the equation for the solutions over the interval [0 degrees, 360 degrees) 6sec2xtanx=12tanx I am unsure of where to begin.

This question is about to prove some trigonometric identities

sinxcos^4x+cos^6x=

Trigonometry Identities and equation

cos(3theta)=-1 solve for exact solutions over the interval [0,360 degrees] I am having trouble finding a place to start.

Please use special angles of the unit circle and any trigonometry identities if used.

Proving identities

prove that tan6.tan42.tan66.tan78=1

tan34/2(1-tan34) =(2/2)[tan34/2(1-tan34) =2tan34/4(1-tan34) i need to have the form 2tanA/1-tan^2A but i cant eliminate the 4