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You answer the question
BvU said:
Solving a Double Integration Problem with Unknown Variables: How to Proceed?
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chetzread
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it has no meaning , right ? the author just simply put inside the equation, right ?BvU said:
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You think I annoy you with so many questions when there is no meaning ? What is the sine of the red angle ? What is the cosine ?
chetzread
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BvU said:
It's cos theta, so?BvU said:
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chetzread said:
What do you think?
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@chetzread, I believe that BvU's hint is not about merely switching the order of integration (i.e., dxdy vs. dydx), but instead, about changing to a polar integral. This problem quite a bit easier if you do it this way.
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So ? Wouldn't substituting ##\theta## as integration variable be a sensible thing to try ?chetzread said:
chetzread
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ok, i got the ans now ...I'm wondering is this a special case? I have never learned and see this before ...BvU said:
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Humor me and tell me what you did ...
chetzread
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？BvU said:
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You said
could you share your working with us ?chetzread said: