જો $5 f(x) + 3 f\left(\frac{1}{x}\right) = x + 2$ અને $y = x f(x)$ હોય,તો $x = 1$ આગળ $\frac{dy}{dx}$ ની કિંમત શોધો.

  • A
    $14$
  • B
    $\frac{7}{8}$
  • C
    $1$
  • D
    $7$

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કોઈ નિશ્ચિત વાસ્તવિક સંખ્યા $a$ માટે $x^{n}+a x^{n-1}+a^{2} x^{n-2}+ \dots +a^{n-1} x+a^{n}$ નું વિકલન શોધો.

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