1/tanx+1的积分,

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1/tanx+1的积分,
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1/tanx+1的积分,
1/tanx+1的积分,

1/tanx+1的积分,
=∫cost/(sint+cost)dt=1/2∫ (cost+sint+cost-sint)/(sint+cost)dt
=1/2∫ (cost+sint)/(sint+cost)dt+1/2∫ (cost-sint)/(sint+cost)dt
=1/2∫ 1dt+1/2∫ 1/(sint+cost)d(sint+cost)
超过长度,下面会了吧?

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