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数学
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函数y=sinx的平方+cosx+3/4的值域为?
人气:171 ℃ 时间:2019-12-23 13:13:44
解答
y=sinx的平方+cosx+3/4
=-(cosx)^2+cosx+7/4
=-(cosx-1/2)^2+2
当cosx=1/2时取最大值2
当cosx=-1时取最小值-1/4
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