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$\cos ^{2} 45^{\circ}-\sin ^{2} 15^{\circ}$ का मान क्या है?

यदि $\tan \left( \frac{\pi }{4} + \theta \right) + \tan \left( \frac{\pi }{4} - \theta \right) = \lambda \sec 2\theta$ है,तो $\lambda$ =

यदि $(1 + \tan \theta )(1 + \tan \phi ) = 2$ है,तो $\theta + \phi = \dots ^\circ$

यदि $\tan A=\frac{1}{\sqrt{x(x^2+x+1)}}, \tan B=\frac{\sqrt{x}}{\sqrt{x^2+x+1}}$ और $\tan C=\sqrt{x^{-1}+x^{-2}+x^{-3}}$ है,तो:

$\cos^2 \left( \frac{\pi}{6} + \theta \right) - \sin^2 \left( \frac{\pi}{6} - \theta \right) = $

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