यदि $\cos ^{-1}\left(\frac{5}{13}\right)+\cos ^{-1}\left(\frac{3}{5}\right)=\cos ^{-1} x$ है, तो $x$ का मान ज्ञात कीजिए।

  • A
    $\frac{3}{65}$
  • B
    $\frac{-36}{65}$
  • C
    $\frac{-33}{65}$
  • D
    $-1$

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$\begin{aligned} & 2 \sin ^{-1} x+\sin ^{-1}\left(2 x \sqrt{1-x^2}\right)+3 \cos ^{-1} x \\ & -\cos ^{-1}\left(4 x^3-3 x\right) \text{का मान ज्ञात कीजिए।}\end{aligned}$

सिद्ध कीजिए कि $\cos ^{-1} \frac{4}{5} + \cos ^{-1} \frac{12}{13} = \cos ^{-1} \frac{33}{65}$

$\sin ^{-1} \frac{4}{5} + 2 \tan ^{-1} \frac{1}{3}$ का मान ज्ञात कीजिए।

$\cot ^{-1}\left(2 \cdot 1^2\right)+\cot ^{-1}\left(2 \cdot 2^2\right)+\cot ^{-1}\left(2 \cdot 3^2\right)+\ldots \ldots \ldots \infty =$

$x > 0$ के लिए $\tan ^{-1} \frac{1-x}{1+x}=\frac{1}{2} \tan ^{-1} x$ को हल करें।

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