જો $\cos(\theta - \alpha) = a$ અને $\sin(\theta - \beta) = b$ હોય,તો $\cos^2(\alpha - \beta) + 2ab\sin(\alpha - \beta)$ ની કિંમત શોધો.

  • A
    $4a^2b^2$
  • B
    $a^2 - b^2$
  • C
    $a^2 + b^2$
  • D
    $-a^2b^2$

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$\cos 20^\circ \cos 40^\circ \cos 80^\circ = $

જો $x = r \cos \theta \cos \phi$,$y = r \cos \theta \sin \phi$ અને $z = r \sin \theta$ હોય,તો $x^{2} + y^{2} + z^{2}$ ની કિંમત શોધો.

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$(\operatorname{cosec} a - \sin a)(\sec a - \cos a)(\tan a + \cot a)$ ની કિંમત શોધો.

જો $A + C = B$ હોય,તો $\tan A \tan B \tan C = $

$(\sec 2A + 1){\sec ^2}A = $

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