这两个不定积分怎么算啊 求过程 求解释!! 急
1个回答
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= √1-x/√1+x
令x=cost
则原式=∫√(1-cost)/(1+cost)dcost
=∫√(1-cos^2t)/(1+cost)^2dcost
∫-sin^2t/(1+cost)dt
=∫(cos^2t-1)/(1+cost)dt
=∫cost-1dt
=-sint-t+c
=-√(1-x^2) - arccost + c
令x=cost
则原式=∫√(1-cost)/(1+cost)dcost
=∫√(1-cos^2t)/(1+cost)^2dcost
∫-sin^2t/(1+cost)dt
=∫(cos^2t-1)/(1+cost)dt
=∫cost-1dt
=-sint-t+c
=-√(1-x^2) - arccost + c
追答
2. [(x+1)/(x²+1)]dx=∫[x/(x²+1) +1/(x²+1)]dx=(1/2)ln(x²+1) +arctanx +C
追问
第一个不懂诶
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