用a代替
錯了,應(yīng)該是sin(170-a)
原式=cos(70+a)sin[180-(170-a)]-sin(70+a)cos(10+a)
=cos(70+a)sin(10+a)-sin(70+a)cos(10+a)
=sin[(10+a)-(70+a)]
=sin(-60)
=-√3/2
化簡:(2)cos(70°+α)sin(170°+α)-sin(70°+α)cos(10°+α)
化簡:(2)cos(70°+α)sin(170°+α)-sin(70°+α)cos(10°+α)
數(shù)學(xué)人氣:954 ℃時間:2020-03-26 20:23:09
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