Prove that Tan3θ/( 1 + Tan2θ) + Cot3θ/(1 + Cot2θ) = SecθCosecθ - 2SinθCosθ
Solution:
Tan3θ/( 1 + Tan2θ) + Cot3θ/(1 + Cot2θ) = SecθCosecθ - 2SinθCosθ