જો $\cos^{-1} x - \cos^{-1} \frac{y}{2} = \alpha$ હોય,તો $4x^2 - 4xy \cos \alpha + y^2$ ની કિંમત શોધો.

  • A
    $4 \sin^2 \alpha$
  • B
    $-4 \sin^2 \alpha$
  • C
    $2 \sin 2\alpha$
  • D
    $4$

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Similar Questions

જો $\sum_{n=1}^k \tan ^{-1}\left(\frac{1}{n^2+3 n+3}\right)=\tan ^{-1} \alpha$ હોય,તો $\alpha=$

જો $\sin ^{-1} x - \cos ^{-1} x = \frac{\pi}{6}$ હોય,તો $x$ ની કિંમત શોધો.

જો $\frac{a}{b} \tan x > -1$ હોય,તો $\tan ^{-1}\left[\frac{a \cos x-b \sin x}{b \cos x+a \sin x}\right]$ નું સાદું રૂપ આપો.

$x$ ના મૂલ્યોનો ગણ શોધો જેથી $\tan ^{-1}\left(\frac{x}{x-2}\right)-\tan ^{-1}\left(\frac{x}{2 x-1}\right)=\tan ^{-1}\left(\frac{2}{3}\right)$ થાય.

વિધાન-$1$: ${\cot ^{ - 1}}\left[ {\frac{{\log (e/{x^2})}}{{\log (ex^2)}}} \right] + {\cot ^{ - 1}}\left[ {\frac{{\log (ex^2)}}{{\log (e/{x^2})}}} \right] = \frac{\pi}{2}$
વિધાન-$2$: ${\tan ^{ - 1}}\left[ {\frac{{1 + \log {x^2}}}{{1 - \log {x^2}}}} \right] = {\tan ^{ - 1}}1 + {\tan ^{ - 1}}(\log {x^2})$

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