જો $x = A \cos 4t + B \sin 4t$ હોય,તો $\frac{d^2x}{dt^2} = $

  • A
    $-16x$
  • B
    $16x$
  • C
    $x$
  • D
    $-x$

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ધારો કે $f$ એ બે વાર વિકલનીય વિધેય છે જેથી $f^{\prime \prime}(x) = -f(x)$,$f^{\prime}(x) = g(x)$ અને $h(x) = (f(x))^2 + (g(x))^2$ થાય. જો $h(5) = 1$ હોય,તો $h(10)$ ની કિંમત શોધો.

જો $\frac{x^2}{a^2}+\frac{y^2}{b^2}=1$ હોય, તો $\frac{d^2 y}{d x^2}=$

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