જો $y = A \cos(nx) + B \sin(nx)$ હોય,તો $\frac{d^2y}{dx^2} = $

  • A
    $n^2y$
  • B
    $-y$
  • C
    $-n^2y$
  • D
    આમાંથી કોઈ નહીં

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$y=\sin ^{-1}\left\{\frac{5 x+12 \sqrt{1-x^{2}}}{13}\right\} ;|x| \leq 1$ માટે, જો $a\left(1-x^{2}\right) y_{2}+b x y_{1}=0$ હોય તો $(a, b)=$

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