高数!求定积分(0到π),根号下(sinx-(sinx)^3) dx

来源:学生作业帮助网 编辑:作业帮 时间:2024/07/12 07:26:04
高数!求定积分(0到π),根号下(sinx-(sinx)^3) dx
x){zƳmlznvac{:u-@̼ ] gRaTO v6pţ:4ůFQR`!_ 5Ei*@ R*tA a>=0QZ%l55n0AR6]66 @A]]m `kol_\g uo

高数!求定积分(0到π),根号下(sinx-(sinx)^3) dx
高数!求定积分(0到π),根号下(sinx-(sinx)^3) dx

高数!求定积分(0到π),根号下(sinx-(sinx)^3) dx
∫(0,π)√[sinx-(sinx)^3]dx =∫(0,π)√[sinx(cosx)^2] =∫(0,π/2)cosx√sinxdx-∫(π/2,π)cosx√sinxdx =∫(0,π/2)√sinxdsinx-∫(π/2,π)√sinxdsinx =(2/3)(sinx)^(3/2)-(2/3)(sinx)^(3/2) =(2/3)(sinπ/2)^(3/2)-(2/3)(sin0)^(3/2)-(2/3)(sinπ)^(3/2)+(2/3)(sinπ/2)^(3/2) =2/3-0-0+2/3 =4/3