∫dx/sincx = ∫dx/[2sim(cx/2)cos(cx/2)]
= (1/c)∫d(cx/2)/[sim(cx/2)cos(cx/2)]
= (1/c)∫[sec(cx/2)]^2d(cx/2)/tan(cx/2)
= (1/c)∫dtan(cx/2)/tan(cx/2)
= (1/c)ln|tan(cx/2)| + C.
追问请问:sim是sin吗?谢谢!
追答用的倍角公式,是 sin,打错了。
追问我按照您推导的公式解了一道题,烦请您帮助检查一下。谢谢!
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