यदि $5 f(x) + 3 f\left(\frac{1}{x}\right) = x + 2$ और $y = x f(x)$ है,तो $x = 1$ पर $\frac{dy}{dx}$ का मान ज्ञात कीजिए।

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

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यदि $f(x) = \cos^{-1} x$,$g(x) = e^x$ और $h(x) = g(f(x))$ है,तो $\frac{h'(x)}{h(x)} = $

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दिया गया है कि $\frac{d}{dx}f(x) = f'(x)$। संबंध $f'(a + b) = f'(a) + f'(b)$ मान्य है यदि $f(x)$ बराबर है

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