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数学
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1+cosx+sinx不等于o,sin(x+pai/4)不等于-根号2/2,为什么呀,
人气:117 ℃ 时间:2019-09-20 06:25:08
解答
sinx+cosx≠-1
√2/2sinx+√2/2cosx≠-√2/2
sinxcosπ/4+cosxsinπ/4≠-√2/2
sin(x+π/4)≠-√2/2
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