角a的终边经过p(-1,根号3),则snia+cosa等于多少?
人气:317 ℃ 时间:2020-04-01 15:59:39
解答
用三角函数的定义求三角函数值
r=√(x²+y²)=√(1+3)=2
sina=y/r=√3/2
cosa=x/r=-1/2
所以snia+cosa=(√3-1)/2
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