求下列不定积分:

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问题 求下列不定积分:

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答案 [*] =-cot x.ln sin x+∫cot2 xdx =-cot x.ln sinx+∫(csc2 x—1)dx =一cotx.ln sin x—cot x一x+C. [*] (4)∫e2x(tanx+1)2dx =∫e2x(sec2x+2tan x)dx =∫e2xsec2x dx+2∫e2xtan xdx =∫e2xdtanx+2∫e2xtanx dx =e2xtanx一∫tan xde2x+2∫e2xtanxdx =e2xtanx一2∫tanx.e2xdx+2∫e2xtanxdx =e2xtanx+C

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