Question

∫dx/（1+cosx）不定积分

Answer 1

∫cosx/(1+cosx)dx
=2∫[cos^2(x/2)-sin^2(x/2)]/[cos^2(x/2)]dx
=2∫[1-tan^2(x/2)]dx
=2∫[2-sec^2(x/2)]dx
=4x-4tan(x/2)+C
你的好评是我前进的动力.
我在沙漠中喝着可口可乐,唱着卡拉ok,骑着狮子赶着蚂蚁,手中拿着键盘为你答题!