1 answer:
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You have
y as an implicit function of
x :
sin(xy) – x = 0 Use implicit differentiation. As
y is a function of
x , then you must apply the chain rule there:
d d —— [ sin(xy) – x ] = —— (0) dx dx d d d —— [ sin(xy) ] – —— (x) = —— (0) dx dx dx d —— [ sin(xy) ] – 1 = 0 dx d —— [ sin(xy) ] = 1 dx d cos(xy) · —— (xy) = 1 dx Now, apply the product rule for that last derivative:
dy Isolate
—— :
dx dy x cos(xy) · —— = 1 – y cos(xy) dx Assuming
x cos(xy) ≠ 0 ,
dy 1 – y cos(xy) —— = ———————— <——— this is the answer.
dx x cos (xy) I hope this helps. =)
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