f(a)=√[sin﹙π-α﹚cos﹙2π-α﹚tan﹙﹣α+3π/2﹚] ( 1)已知α为第三象限角,化简f(α﹚
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(1) sin﹙π-α﹚cos﹙2π-α﹚tan﹙﹣α+3π/2﹚
=sinα*cosα*cotα
=sinα*cosα*cosα/sinα
=cos²α
∵α为第三象限角,∴cosα
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