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求证sinx-cosx=根号2sin(x-π/4)
人气:490 ℃ 时间:2019-12-10 05:18:05
解答
√2 sin(x-π/4)=√2(sinxcosπ/4-cosxsinπ/4)
=√2[(1/√2)sinx - (1/√2)cosx]
=sin x - cos x
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