cos(2a＋b)+2sin(a＋b)sina
=cos(a＋b)cosa-sin(a＋b)sina+2sin(a＋b)sina
=cos(a＋b)cosa+sin(a＋b)sina
=cos(a+b-a)
=cos(b)
化简cos(2a＋b)+2sin(a＋b)sina
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