Cos^2θ+2msinθ-2m-2

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Cos^2θ+2msinθ-2m-2
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Cos^2θ+2msinθ-2m-2
Cos^2θ+2msinθ-2m-2

Cos^2θ+2msinθ-2m-2
Cos^2θ+2msinθ-2m-2
=-sin^2θ +2msinθ-2m-1
=-(sinθ -m)^2 +m^2 -2m-1
令t=sinθ -1