急~一道高一数学题 若sin(180°+α)+cos(90°+α)=-α,则cos(270°-α)+2sin(360°-
2个回答
sin(180°+α)+cos(90°+α)=-α
-2sinα=-α
sinα=α/2
cos(270°-α)+2sin(360°-α)
=-sinα-2sinα
=-3sinα
=3α/2
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