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

  • A
    $0$
  • B
    $1$
  • C
    $3$
  • D
    $-3$

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Similar Questions

જો ${\sin ^{ - 1}}\left( {\frac{{2a}}{{1 + {a^2}}}} \right) + {\sin ^{ - 1}}\left( {\frac{{2b}}{{1 + {b^2}}}} \right) = 2{\tan ^{ - 1}}x,$ હોય,તો $x = $

જો $y = \sec^{-1}\left( \frac{x + 1}{x - 1} \right) + \sin^{-1}\left( \frac{x - 1}{x + 1} \right)$ હોય,તો $\frac{dy}{dx} = $

સમીકરણ $\sin^{-1}x - \cos^{-1}x = \cos^{-1}\left(\frac{\sqrt{3}}{2}\right)$ માટે

$\tan ^{-1} \frac{1}{3}+\tan ^{-1} \frac{1}{5}+\tan ^{-1} \frac{1}{7}+\tan ^{-1} \frac{1}{8}$ ની કિંમત $ . . . . . . $ છે.

સાબિત કરો કે $\sin ^{-1}(2 x \sqrt{1-x^{2}})=2 \cos ^{-1} x$,જ્યાં $\frac{1}{\sqrt{2}} \leq x \leq 1$.

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