求值:cot(-a-π)·sin(a π)分之cos(-a)·tan(2π a)
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求值:cot(-a-π)·sin(a π)分之cos(-a)·tan(2π a)
求值:cot(-a-π)·sin(a π)分之cos(-a)·tan(2π a)
求值:cot(-a-π)·sin(a π)分之cos(-a)·tan(2π a)
原式=cosatana/(-cota)(-sina)
=cosa*sina/cosa/[(cosa/sina)*sina]
=sina/cosa
=tana