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若3sina-根号3cosa=2根号3sin(a-b),-π/2
人气:401 ℃ 时间:2020-06-12 17:01:19
解答
3sina-根号3cosa
=根号(3^2+3)cos(a+arctan(-根号3/3))
=2根号3cos(a-pai/6)
=2根号3sin(a-b)
,-π/2
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