$\cot (45^\circ + \theta ) \cot (45^\circ - \theta ) = $

  • A
    $-1$
  • B
    $0$
  • C
    $1$
  • D
    $\infty $

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ત્રિકોણમિતીય કોષ્ટકનો ઉપયોગ કર્યા વિના,કિંમત શોધો: $\sin 48^{\circ} \sec 42^{\circ} + \cos 48^{\circ} \operatorname{cosec} 42^{\circ} = $

જો $\cos \theta = \frac{1}{2}\left( a + \frac{1}{a} \right)$ હોય,તો $\cos 3\theta$ નું મૂલ્ય કેટલું થાય?

$\frac{\sin ^{3} A+\cos ^{3} A}{\sin A+\cos A}+\frac{\cos ^{3} A-\sin ^{3} A}{\cos A-\sin A}$ ની કિંમત શોધો.

$\frac{\sec 8A - 1}{\sec 4A - 1} = $

$\cos A + \cos (240^\circ + A) + \cos (240^\circ - A) = $

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