(1+sin4θ-cos4θ)/(1+sin4θ+cos4θ)-(1+sin4θ+cos4θ)/(1+sin4θ-cos4θ)

问题描述:

(1+sin4θ-cos4θ)/(1+sin4θ+cos4θ)-(1+sin4θ+cos4θ)/(1+sin4θ-cos4θ)

(1+sin4θ-cos4θ)/(1+sin4θ+cos4θ)-(1+sin4θ+cos4θ)/(1+sin4θ-cos4θ)=(1+2sin2θcos2θ-1+2sin²2θ)/(1+2sin2θcos2θ+2cos²2θ-1)-(1+2sin2θcos2θ+2cos²2θ-1)/(1+2sin2θcos2θ-1+2sin...