已知0＜β＜π/4＜α＜3π/4,cos(π/4+α)=3/5,sina(3π/4+β)=5/13,求sina(2α+2β)的值
已知0＜β＜π/4＜α＜3π/4,cos(π/4-α)=3/5,sina(3π/4+β)=5/13,求sina(α+β)的值
人气：367 ℃ 时间：2020-02-05 16:05:52
解答
cos(π/4-α)=3/5
π/4
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