$x=\frac{1}{5}$ હોય ત્યારે $\cos \left(2 \cos ^{-1} x+\sin ^{-1} x\right)$ ની કિંમત શોધો,જ્યાં $0 \leq \cos ^{-1} x \leq \pi$ અને $-\frac{\pi}{2} \leq \sin ^{-1} x \leq \frac{\pi}{2}$ છે.

  • A
    $-\frac{\sqrt{6}}{5}$
  • B
    $\frac{\sqrt{6}}{5}$
  • C
    $-\frac{2 \sqrt{6}}{5}$
  • D
    $\frac{2 \sqrt{6}}{5}$

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$\cot \left( \sum\limits_{r = 1}^\infty \tan^{-1} \left( \frac{4}{4r^2 + 3} \right) \right)$ નું મૂલ્ય કેટલું થાય?

$\cot \left( {\sum\limits_{n = 1}^{19} {{{\cot }^{ - 1}}\left( {1 + \sum\limits_{p = 1}^n {2p} } \right)} } \right)$ નું મૂલ્ય શોધો.

જો $\tan ^{-1}\left(\frac{x-1}{x-2}\right)+\tan ^{-1}\left(\frac{x+1}{x+2}\right)=\frac{\pi}{4}$ હોય,તો $x$ ની કિંમતો શોધો.

જો $\sin^{-1} x + \sin^{-1} y + \sin^{-1} z = \frac{\pi}{2}$ હોય,તો $x^2 + y^2 + z^2 + 2xyz$ ની કિંમત કેટલી થાય?

સાબિત કરો કે $\tan ^{-1} \frac{1}{2}+\tan ^{-1} \frac{2}{11}=\tan ^{-1} \frac{3}{4}$

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