∫(π/3 to π/4) x/sinx dx =∫(π/3 to π/4) xcscx dx =∫(π/3 to π/4) x d(-cotx) =-xcotx(π/3 to π/4) + ∫(π/3 to π/4) cotx dx，分部积分法 =π/(3√3)-π/4 + ln|sin|(π/3 to π/4) =π/(3√3)-π/4 - (1/2)ln(3/2)
用分部积分法，x*csc方x+定积分π/4到π/3（csc方x）dx
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