the integral (from 0 to a) of sqrt(a^2 -r^2) 2r dr. Thank you very much.
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I might be wrong though
Good work. That's correct.
hi nertil1 , Thanks. Could you please show how you come up with this answer? Thank you very much.
Originally Posted by kittycat hi nertil1 , Thanks. Could you please show how you come up with this answer? Thank you very much. Use the substitution
Let .
Let Remember, This leads to: But, Sub back in and get: Sub in the limits of integration and get:
Why use such a scary substitution? The derivative already appears on the outside.
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