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∫1/sinx dx
=∫宏敬拆[(sin²(x/2)+cos²(x/2)]/[2sin(x/2)cos(x/2)蔽枣]dx
=1/2 ∫[tan(x/2)+cot(x/2)]dx
=1/2[-ln|cos(x/2)|+ln|sin(x/稿迹2)|] + C
=1/2 ln|tan(x/2)| +C
=∫宏敬拆[(sin²(x/2)+cos²(x/2)]/[2sin(x/2)cos(x/2)蔽枣]dx
=1/2 ∫[tan(x/2)+cot(x/2)]dx
=1/2[-ln|cos(x/2)|+ln|sin(x/稿迹2)|] + C
=1/2 ln|tan(x/2)| +C
追答
上面错了
∫1/sinx dx
=∫[(sin²(x/2)+cos²(x/2)]/[2sin(x/2)cos(x/2)]dx
=1/2 ∫[tan(x/2)+cot(x/2)]dx
=∫[tan(x/2)+cot(x/2)]d(x/2)
=-ln|cos(x/2)|+ln|sin(x/2)|] + C
=ln|tan(x/2)| +C
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