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函数y=sinx-cosx化为正弦函数为?
人气:396 ℃ 时间:2020-01-28 01:58:05
解答
y=sinx-cosx
=√2*(√2/2*sinx-√2/2*cosx)
=√2(sinxcosπ/4-cosxsinπ/4)
=√2sin(x-π/4) .
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