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If u =tan^(-1)((x ^(4) +y ^(4))/(x ^(2)-...

If `u =tan^(-1)((x ^(4) +y ^(4))/(x ^(2)-y ^(2)))` show that `x (delu)/(delx) + y(del u)/(dely) = sin 2u.`

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PREMIERS PUBLISHERS-MODEL QUESTION PAPER -1-Part -IV
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