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anonymous

  • 5 years ago

a double integeration question double integral over limit 1 to and limit 1 to x dydx upon x2 + y2

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  1. anonymous
    • 5 years ago
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    You do a partial integration of the Internal integration, then the same on the external. eg, \[\int\limits_{5}^{y}\int\limits_{3}^{x}(x+y)dxdy\] Would start with you doing: \[\int\limits_{3}^{x}(x+y)dx\] With respect to x, so you pretend y is just a number (a constant). Then do what's left.

  2. anonymous
    • 5 years ago
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    \[\int\limits_{1}^{2}\int\limits_{1}^{x} dydx/x^2+y^2\] is the question how to solve

  3. anonymous
    • 5 years ago
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    It'll look nicer if you make it: \[\int\limits_{1}^{2}\int\limits_{1}^{x} 1/(x ^{2}+y ^{2}) dydx\] Do the internal part first: \[\int\limits_{1}^{x}1/(x ^{2}+y ^{2}) dy\] Do the integration, which doesn't look too easier, but try substitution. Treat x like a constant, and when you enter your limits you'll be left with all x's. Then do the second integration which''ll be easier.

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