问题标题:
【化简:(1)sin(π2+α)cos2(π2+α)sin(3π-α)tan(π+α);(2)sin(-4π+α)cos(π-α)cos(π2+α)sin(11π2-α)sin(-π2-α)cos(3π-α)cos(9π2+α)sin(π+α).】
问题描述:
化简:
(1)sin(
(2)
唐先明回答:
(1)原式=cosα•sin2α•sinα•tanα=cosα•sin2α•sinα•sinαcosα
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