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高数求∫1/sint dt
人气:336 ℃ 时间:2020-09-06 04:05:07
解答
∫1/sint dt=∫sint /(sint)^2 dt=∫-1/(sint)^2 dcost=∫-1/(1-(cos t)^2) d cost
=-1∫1/(1-cos t)(1+cos t) d cost=-1/2∫1/(1-cos t)+1/(1+cos t) d cost=-1/2( ln|cost +1|+ln|cost-1|)+C
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