∫[0,1]dx∫[x,√x]siny/ydy 的二重积分
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∫[0,1]dx∫[x,√x]siny/ydy 的二重积分
交换积分次序:
∫[0,1]dx∫[x,√x]siny/ydy
=∫[0,1]dy∫[y²--->y] siny/y dx
=∫[0,1] (siny/y)(y-y²)dy
=∫[0,1] (siny-ysiny)dy
=∫[0,1] sinydy-∫[0,1] ysinydy
=-cosy+∫[0,1] yd(cosy)
=-cosy+ycosy-∫[0,1] cosydy
=-cosy+ycosy-siny |[0,1]
=-cos1+cos1-sin1+1
=1-sin1
∫[0,1]dx∫[x,√x]siny/ydy
=∫[0,1]dy∫[y²--->y] siny/y dx
=∫[0,1] (siny/y)(y-y²)dy
=∫[0,1] (siny-ysiny)dy
=∫[0,1] sinydy-∫[0,1] ysinydy
=-cosy+∫[0,1] yd(cosy)
=-cosy+ycosy-∫[0,1] cosydy
=-cosy+ycosy-siny |[0,1]
=-cos1+cos1-sin1+1
=1-sin1
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