જો $f(x) = (\cos x)(\cos 2x) \ldots (\cos nx)$ હોય, તો $f^{\prime}(x) + \sum_{r=1}^n (r \tan rx) f(x)$ ની કિંમત શોધો.

  • A
    $f(x)$
  • B
    $0$
  • C
    $-f(x)$
  • D
    $2f(x)$

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જો $\frac{x}{x-y} = \log \left(\frac{a}{x-y}\right)$ હોય,તો $\frac{dy}{dx} =$

જો ${x^y} = {e^{x - y}}$ હોય,તો $\frac{dy}{dx} = $

જો ${x^2}{e^y} + 2xy{e^x} + 13 = 0$ હોય,તો $\frac{dy}{dx}$ ની કિંમત શું થાય?

જો $\tan y = \frac{x \sin \alpha}{1-x \cos \alpha}$ અને $\frac{dy}{dx} = \frac{m}{x^2+2nx+1}$ હોય,તો $m^2+n^2$ ની કિંમત શોધો.

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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