化简 f(α)=sin(π/2-α)cos(π/2+α) 这整个除以sin(π+α)
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化简 f(α)=sin(π/2-α)cos(π/2+α) 这整个除以sin(π+α)
化简 f(α)=sin(π/2-α)cos(π/2+α) 这整个除以sin(π+α)
化简 f(α)=sin(π/2-α)cos(π/2+α) 这整个除以sin(π+α)
f(α)=sin(π/2-α)cos(π/2+α)/sin(π+a)
=cosacosa/(-sina)
=(1-sin²a)/(-sina)
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化简 f(α)=sin(π/2-α)cos(π/2+α) 这整个除以sin(π+α)
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