$\sec \left(\tan ^{-1} \frac{y}{2}\right) = $

  • A
    $\sqrt{\frac{4+y^2}{2}}$
  • B
    $\sqrt{\frac{4-y^2}{2}}$
  • C
    $\frac{\sqrt{4+y^2}}{2}$
  • D
    $\frac{\sqrt{4-y^2}}{2}$

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$\cos ^{-1}\left(-\frac{1}{\sqrt{2}}\right)$ का मुख्य मान ज्ञात कीजिए।

$\sin ^{-1}\left(-\frac{1}{2}\right)$ का मुख्य मान ज्ञात कीजिए।

$\sin \left(2 \sin ^{-1} 0.8\right)$ का मान किसके बराबर है?

यदि $2\cos^{-1}\sqrt{\frac{1+x}{2}} = \frac{\pi}{2}$ है,तो $x = $

$\operatorname{sech}^{-1}\left(\frac{1}{\sqrt{2}}\right)+\operatorname{cosech}^{-1}(-1)=$

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