（1）sin(α+π)cos(-α)sin(-α-π)
=(-sinα)*cosα*(sinα)
=-sin²α*cosα
（2）sin³（-α）cos（2π+α）tan（-α-π）
=(-sinα)³*cosα*(-tanα)
=-sin³α*cosα*(-sinα/cosα)
=(sinα)^4
化简（1）sin(α+π)cos(-α)sin(-α-π) （2）sin³（-α）cos（2π+α）tan（-
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