∫[(2x+3)/√1+x2]dx
∫[(2x+3)/√1+x2]dx
【正确答案】:∫(2x+3)/√1+x2=∫(1+x2)-(1/2)-(1/2)d(1+x2)+3∫dx/√1+x2 =2√1+x2+3∫(1/√1+tan2t)dtant=tant) =2√1+x2+3∫(sec2t/sect)dt =2√1+x2+3ln|sect+tant|+C =2√1+x2+3ln|x+x2I+C.
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