sina+cosa=-1/3.a∈(派,2派)
人气:201 ℃ 时间:2020-07-15 06:23:35
解答
sina+cosa=-1/3两边同时平方得sin²a+2sinacosa+cos²a=1/9(sin²a+cos²a)+2sinacosa=1/91+sin2a=1/9sin2a=-8/92a=arcsin(-8/9)a=[arcsin(-8/9)]/2 明白请采纳,有疑问请追问!有...
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