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

  • A
    $-\frac{2x{e^{y-x}} + 2y(x+1)}{x(x{e^{y-x}} + 2)}$
  • B
    $\frac{2x{e^{x-y}} + 2y(x+1)}{x(x{e^{y-x}} + 2)}$
  • C
    $-\frac{2x{e^{x-y}} + 2y(x+1)}{x(x{e^{x-y}} + 2)}$
  • D
    આમાંથી કોઈ નહીં

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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.

જો $x \sin (\alpha+y)=\sin y$ અને $y=\frac{m}{x^2+2 n x+1}$ હોય,તો $m^2=$

જો $y$ એ $x$ નું વિધેય હોય અને $\log (x+y)=2xy$ હોય,તો $y^{\prime}(0)$ નું મૂલ્ય શોધો.

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