જો $\cos^{-1} p + \cos^{-1} q + \cos^{-1} r = \pi$ હોય,તો $p^2 + q^2 + r^2 + 2pqr = $

  • A
    $3$
  • B
    $1$
  • C
    $2$
  • D
    $-1$

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Similar Questions

જો $\cos ^{-1} x+\cos ^{-1} y+\cos ^{-1} z=3 \pi$ હોય, તો

ધારો કે $\tan ^{-1} y = \tan ^{-1} x + \tan ^{-1} \left( \frac{2x}{1 - x^2} \right)$,જ્યાં $|x| < \frac{1}{\sqrt{3}}$,તો $y$ ની એક કિંમત શું છે?

જો $\sin ^{-1}\left(\frac{3}{x}\right)+\sin ^{-1}\left(\frac{4}{x}\right)=\frac{\pi}{2}$ હોય, તો $x$ ની કિંમત શોધો.

જો $\tan ^{-1}\left(\frac{1}{4}\right)+\tan ^{-1}\left(\frac{2}{9}\right)=\frac{1}{2} \cos ^{-1} x$ હોય,તો $x$ ની કિંમત શોધો.

જો ત્રિકોણ $ABC$ માં $\angle A = 90^\circ$ હોય,તો $\tan^{-1}\left(\frac{c}{a+b}\right) + \tan^{-1}\left(\frac{b}{a+c}\right) = $

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