1+sin4Θ-cos4Θ=2sin2θcos2θ+2(sin2θ)^2=2sin2θ(sin2θ+cos2θ)1+sin4Θ+cos4Θ=2sin2θcos2θ+2(cos2θ)^2=2cos2θ(sin2θ+cos2θ)∴1+sin4Θ-cos4Θ/1+sin4Θ+cos4Θ=tan2θ= - cot2(θ+π/4)= - (1-tan(θ+...