计算:2(2-sinθ)(1+cosθ)-(1-sinθ+cosθ)^2 计算:2(1-sinθ)(1+cosθ)-(1-sinθ+cosθ)^2 打错了
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计算:2(2-sinθ)(1+cosθ)-(1-sinθ+cosθ)^2 计算:2(1-sinθ)(1+cosθ)-(1-sinθ+cosθ)^2 打错了
计算:2(2-sinθ)(1+cosθ)-(1-sinθ+cosθ)^2
计算:2(1-sinθ)(1+cosθ)-(1-sinθ+cosθ)^2
打错了
计算:2(2-sinθ)(1+cosθ)-(1-sinθ+cosθ)^2 计算:2(1-sinθ)(1+cosθ)-(1-sinθ+cosθ)^2 打错了
2(1-sinθ)(1+cosθ)-(1-sinθ+cosθ)^2
=2(1+cosθ-sinθ-sinθ*cosθ)-[1+sin^2θ+cos^2θ+2cosθ-2sinθ-2sinθ*cosθ]
=2+2cosθ-2sinθ-2sinθ*cosθ-1-(sin^2θ+cos^2θ)-2cosθ+2sinθ+2sinθ*cosθ
=0
2(1-sinθ)(1+cosθ)-(1-sinθ+cosθ)^2
=2(1+cosθ-sinθ-sinθcosθ)-[(1-sinθ)²+2(1-sinθ)cosθ+cos²θ]
=2+2cosθ-2sinθ-2sinθcosθ-(1-2sinθ+sin²θ+2cosθ-2sinθcosθ+cos²θ)
=2+2cosθ-2sinθ-2sinθcosθ-(2-2sinθ+2cosθ-2sinθcosθ)
=0
计算:2(2-sinθ)(1+cosθ)-(1-sinθ+cosθ)^2 计算:2(1-sinθ)(1+cosθ)-(1-sinθ+cosθ)^2 打错了
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