જો $y = \tan ^{-1}\left(\frac{1}{1+x+x^{2}}\right) + \tan ^{-1}\left(\frac{1}{x^{2}+2x+3}\right) + \tan ^{-1}\left(\frac{1}{x^{2}+5x+7}\right) + \dots + n \text{ પદો}$,તો $y'(0)$ શોધો.

  • A
    $\frac{\pi}{2}$
  • B
    $\frac{2n}{1+n^{2}}$
  • C
    $\frac{n^{2}}{1+n^{2}}$
  • D
    $-\frac{n^{2}}{1+n^{2}}$

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સાબિત કરો કે $\sin ^{-1} \frac{12}{13}+\cos ^{-1} \frac{4}{5}+\tan ^{-1} \frac{63}{16}=\pi$

જો $x \in [0, 1]$ હોય,તો સમીકરણ $2[\cos^{-1}x] + 6[\text{sgn}(\sin x)] = 3$ ના ઉકેલોની સંખ્યા કેટલી છે? (જ્યાં $[.]$ એ મહત્તમ પૂર્ણાંક વિધેય દર્શાવે છે અને $\text{sgn}(x)$ એ $x$ નું ચિહ્ન વિધેય દર્શાવે છે)-

$\sum\limits_{\lambda = 1}^{10} {{{\sin }^{ - 1}}\left( {\sin \left( {\lambda \pi - \frac{\pi }{6}} \right)} \right)} $ ની કિંમત શોધો.

જો $\sum_{k=1}^n \tan^{-1} \left( \frac{1}{k^2+k+1} \right) = \tan^{-1} ( \theta )$ હોય,તો $\theta =$

$\cot^{-1}(1) + \cot^{-1} (\frac{1}{2}) + \cot^{-1}(\frac{1}{3}) =$

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