1-cosθ/(2sinθ/2)
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1-cosθ/(2sinθ/2)1-cosθ/(2sinθ/2)1-cosθ/(2sinθ/2)1-cosθ=2*(sinθ/2)^2,因此原式的结果是sinθ/2(1-cosΘ)/sinΘ
1-cosθ/(2sinθ/2)
1-cosθ/(2sinθ/2)
1-cosθ/(2sinθ/2)
1-cosθ=2*(sinθ/2)^2,因此原式的结果是sinθ/2
(1-cosΘ)/sinΘ
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求证:(1+cosθ+cosθ/2) /(sinθ+sinθ/2)=sinθ/1-cosθ
1-cosθ/(2sinθ/2)
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sinθ-cosθ=1/2,则sin^3θ-cos^3θ=?.
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