$\tan ^{-1}\left(\frac{1}{3}\right)+\tan ^{-1}\left(\frac{1}{5}\right)+\tan ^{-1}\left(\frac{1}{7}\right)+\tan ^{-1}\left(\frac{1}{8}\right)$ का मान है

  • A
    $\frac{4 \pi}{3}$
  • B
    $\frac{\pi}{4}$
  • C
    $\frac{2 \pi}{4}$
  • D
    $\frac{3 \pi}{4}$

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यदि $y = \sin^{-1}x + \sin^{-1}\sqrt{1-x^2}$,जहाँ $-1 \le x \le 1$ है,तो $\frac{dy}{dx}$ ज्ञात कीजिए।

Difficult
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यदि $\alpha$ और $\beta$ सभी $x \in [-1, 1]$ के लिए $f(x)=(\sin ^{-1} x)^2+(\cos ^{-1} x)^2$ के न्यूनतम और अधिकतम मान हैं,तो $8(\alpha+\beta)=$

$x$ के लिए हल करें: $\tan^{-1}\left(\frac{1-x}{1+x}\right) = \frac{1}{2} \tan^{-1} x$,जहाँ $x > 0$.

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