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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જો $x$ એ અ-ધન સ્વીકાર્ય કિંમત લેતું હોય,તો $\sin^{-1} x =$

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

જો $(\sin ^{-1} x)^{2}-(\cos ^{-1} x)^{2}=a ; 0 < x < 1, a \neq 0$ હોય,તો $2 x^{2}-1$ ની કિંમત શું થાય?

સાબિત કરો કે $\tan ^{-1} \frac{63}{16}=\sin ^{-1} \frac{5}{13}+\cos ^{-1} \frac{3}{5}$

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