ધારો કે $f(x) = \tan^{-1} x$. તો જ્યારે $x$ ની કિંમત કેટલી હોય ત્યારે $f'(x) + f''(x) = 0$ થાય?

  • A
    $0$
  • B
    $1$
  • C
    $-1$
  • D
    $-i$

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જો $y=\tan ^{-1}\left[\frac{\log _e\left(\frac{e}{x^2}\right)}{\log _e\left(e x^2\right)}\right]+\tan ^{-1}\left[\frac{3+2 \log _e x}{1-6 \log _e x}\right]$ હોય,તો $\frac{d^2 y}{d x^2}=$

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