જો $y = a{x^{n + 1}} + b{x^{ - n}}$ હોય,તો ${x^2}\frac{{{d^2}y}}{{d{x^2}}}$ ની કિંમત શું થાય?

  • A
    $n(n - 1)y$
  • B
    $n(n + 1)y$
  • C
    $ny$
  • D
    $n^2y$

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જો $y=x+\tan x$ હોય,તો $\cos ^2 x \frac{d^2 y}{d x^2}+2 x$ ની કિંમત શું થાય?

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