3(sinθ - cosθ)^4+6(sinθ+cosθ)^2+4(sin^6+cos^6)=13
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Answer:
3(cosθ−sinθ)
4+6(sinθ+cosθ)
2+4sin
6
θ
=(cos
2
θ+sin
2
θ−2sinθ+cosθ)
2
+(sin
2
θ+cos
2
θ+2sinθcosθ)+4sin
6
θ
=(1−2sinθcosθ)
2
+(1+2sinθcosθ)+4sin
6
θ
=1+4sin
2
θcos
2
θ−4sinθcosθ+1+2sinθcosθ+4sin
6
θ
=9+12cos
θ
.sin
2
θ+4−12sin
2
θcos
2
θ+4cos
6
θ
=13−4cos
6
θ
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