જો $\cos (x + y) = y\sin x$ હોય,તો $\frac{dy}{dx} = $

  • A
    $ - \frac{\sin (x + y) + y\cos x}{\sin x + \sin (x + y)}$
  • B
    $\frac{\sin (x + y) + y\cos x}{\sin x + \sin (x + y)}$
  • C
    $\frac{y\cos x - \sin (x + y)}{\sin x - \sin (x + y)}$
  • D
    આમાંથી કોઈ નહીં

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જો $xy \neq 0, x+y \neq 0$ અને $x^m y^n=(x+y)^{m+n}$,જ્યાં $m, n \notin N$ હોય,તો $\frac{dy}{dx}$ ની કિંમત શોધો.

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