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f(x)=sinx+cosx=根号2sin(x+pai/4) 是怎么样得来的呢?
人气:162 ℃ 时间:2019-08-20 10:26:07
解答
f(x) = sinx+cosx
= √2(sinx (1/√2) + cosx (1/√2) )
= √2(sinx cosπ/4 + cosx sinπ/4)
= √2(sin(x+π/4))
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