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Question: How to code the double integral ?

Question:How to code the double integral ?

ye_line 8 Maple
integral
June 22 2006
0
Dear all : I have a function qx(x):= 1/21 x in (20,40) = 0 others ; My double integral is like integral ( integral (qx(x1), x1=x-10..40)*integral(qx(x1),x1=x-20..40)*1/20, x = 20...30); since the qx(x)'s is not keep constant on whole range, I am confused with the double integral. Any help is appreciated. Thanks
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