જો $f(x) = 10 \cos x + (13 + 2x) \sin x$ હોય,તો $f''(x) + f(x)$ ની કિંમત શોધો.

  • A
    $4 \cos x$
  • B
    $4 \sin x$
  • C
    $2 \cos x$
  • D
    $2 \sin x$

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

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

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જો $y=a \cos (\sin 2 x)+b \sin (\sin 2 x)$ હોય,તો $y^{\prime \prime}+(2 \tan 2 x) y^{\prime}$ ની કિંમત શોધો.

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