I need help figuring out a few questions. I have to verify the trigonometric equations by substituting identities to match the right hand side of the equation to the left hand side of the equation.

(sin x)(tan x cos x – cot x cos x) = 1 – 2 cos2x

Question

I need help figuring out a few questions. I have to verify the trigonometric equations by substituting identities to match the right hand side of the equation to the left hand side of the equation. 

(sin x)(tan x cos x – cot x cos x) = 1 – 2 cos2x

anonymous · Answer

Start by rewriting any tangents and cotangents as their definitions (aka tan x = sin x/cos x). From there it should be a little easier...