来源:学生作业帮 编辑:大师作文网作业帮 分类:数学作业 时间:2024/11/10 08:24:38
【高数】问一道积分题
(点击大图可放大)
(1/2)∫根号(原式)dx^2=(1/2)∫根号((1-x)/(1+x))dx
=(1/2)∫根号((1-x^2)/(1+x)^2)dx
=(1/2)∫根号(1-x^2)/(1+x)dx
令x=sin(x)
=(1/2)∫cos(x)^2/(1+sin(x)dx
=(1/2)∫(1-sin(x)^2)/(1+sin(x))dx
=(1/2)∫1-sin(x)dx
=(1/2)[x+cox(x)](上限为π/2,下限为0)=π/4-1/2