∫x/(sinx)^2dx
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∫x/(sinx)^2dx
∫x/(sinx)^2dx
∫x/(sinx)^2dx
=∫x(cscx)^2dx
=-∫xdcotx
=-xcotx+∫cotxdx
=-xcotx+∫cosx/sinxdx
=-xcotx+ln|sinx|
用分部积分法,I=-∫xdcotx=-[xcotx-∫cotxdx]=-xcotx+lnsinx+c
lnsinx中的sinx家绝对值!
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