F(a)=sin(3π-a)乘以COS(a+5π)/COS(a-3π)乘以tan(a-4π)化简!

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F(a)=sin(3π-a)乘以COS(a+5π)/COS(a-3π)乘以tan(a-4π)
=sina(-cosa)/(-cosa)tana
=sinacosa/sina
=cosa

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