Continuity and DifferentiabilityHard

Question

If sin (xy) + cos (xy) = 0 then is equal to

Options

A.y/x

B.- y/x

C.- x/y

D.x/y

Solution

sin(xy) + cos (xy) = 0
⇒ cos(xy) - sin(xy) = 0
⇒
⇒

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