(1)原式=-cosa-6cosa/-sina＋4cosa＋4cosa=-7cosa/-sina＋8cosa=5,-7cosa=-5sina＋40cosa,5sina=47cosa,所以tana=47/5;(2)因为tana=sina/cosa=47/5,且sina方＋cosa方=1,解得sina和cosa即可.
Cos(π+α)+6cos(-α)/sin(2π-α)+4sin(二分之π-α)+4sin(二分之π+α)=5
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