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Continuity And Differentiability

Question
CBSEENMA12034783

Find space dy over dx space if space straight x to the power of 6 plus straight y to the power of 6 plus 6 straight x squared straight y squared equals 16.

Solution
We space have
space space space space space space space space space space space space space space space space space space straight x to the power of 6 plus straight y to the power of 6 plus 6 straight x squared straight y squared equals 16
Differentiating space both space sides space straight w. straight r. straight t space straight x comma space we space get comma
space space space space space space space space space space space space space space space space space space space 6 straight x to the power of 5 plus 6 straight y to the power of 5 dy over dx plus 6 open parentheses straight x squared.2 straight y dy over dx plus straight y squared.2 straight x close parentheses equals 0
therefore space space space straight x to the power of 5 plus straight y to the power of 5 dy over dx plus 2 straight x squared straight y dy over dx plus 2 xy squared equals 0
therefore space space left parenthesis straight y to the power of 5 plus 2 straight x squared straight y right parenthesis dy over dx equals negative left parenthesis straight x to the power of 5 plus 2 xy squared right parenthesis
therefore space space dy over dx equals negative fraction numerator straight x left parenthesis straight x to the power of 4 plus 2 straight y squared right parenthesis over denominator straight y left parenthesis straight y to the power of 4 plus 2 straight x squared right parenthesis end fraction

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