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=积分:1/(1+cosx)(sinx) dx + 积分: 1/(cosx+1) dx
=积分:-1/(1+cosx)(1-(cosx)^2) d(cosx) + 积分: 1/2(cos(x/2))^2 dx
=(-1/2)积分:(1/(1+cosx))[(1/(1+cosx))+(1/(1-cosx))] d(cosx) + 积分: 1/(cos(x/2))^2 d(x/2)
=(1/2)(1/(1+cosx))-(1/4)ln(1+cosx)+(1/4)ln(1-cosx) + tan(x/2) +C
=积分:-1/(1+cosx)(1-(cosx)^2) d(cosx) + 积分: 1/2(cos(x/2))^2 dx
=(-1/2)积分:(1/(1+cosx))[(1/(1+cosx))+(1/(1-cosx))] d(cosx) + 积分: 1/(cos(x/2))^2 d(x/2)
=(1/2)(1/(1+cosx))-(1/4)ln(1+cosx)+(1/4)ln(1-cosx) + tan(x/2) +C
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