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

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

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જો $\cos ^{-1}\left(\frac{y}{b}\right)=2 \log \left(\frac{x}{2}\right)$,જ્યાં $x>0$,તો $x^2 \frac{d^2 y}{d x^2}+x \frac{d y}{d x}$ ની કિંમત શું થાય?

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

જો $y=500 e^{7 x}+600 e^{-7 x}$ હોય,તો સાબિત કરો કે $\frac{d^{2} y}{d x^{2}}=49 y$.

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જો $y = \log(\log x)$ હોય,તો $\frac{d^2y}{dx^2}$ ની કિંમત શું થાય?

જો $y=5 \cos x-3 \sin x$ હોય,તો $\frac{d^2 y}{d x^2}=$ . . . . . . .

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