The discussion revolves around a double integration problem where the original poster is struggling to express variables x and y in terms of a new variable u. The context involves evaluating an integral that appears to relate to circular geometry.
There is an ongoing exploration of the problem with various participants offering hints and suggestions. Some participants have pointed out potential issues with the original poster's approach, while others have encouraged visualizing the integration limits. The discussion reflects a mix of interpretations and attempts to clarify the problem without reaching a consensus.
Participants note that the original poster's work may be unclear and that there are constraints related to the integration limits and the geometric interpretation of the region of integration. There is also mention of the need to understand the implications of changing the order of integration.
BvU said:
it has no meaning , right ? the author just simply put inside the equation, right ?BvU said:
BvU said:
It's cos theta, so?BvU said:
chetzread said:
So ? Wouldn't substituting ##\theta## as integration variable be a sensible thing to try ?chetzread said:
ok, i got the ans now ...I'm wondering is this a special case? I have never learned and see this before ...BvU said:
？BvU said:
could you share your working with us ?chetzread said: