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$1+\cos 10^{\circ}+\cos 20^{\circ}+\cos 30^{\circ}=$

$\frac{\sin^2 A - \sin^2 B}{\sin A \cos A - \sin B \cos B} = $

$\frac{\sin(B + A) + \cos(B - A)}{\sin(B - A) + \cos(B + A)} = $

$\sin 75^\circ = $

यदि $m \cos (\alpha+\beta)-n \cos (\alpha-\beta)=m \cos (\alpha-\beta)+n \cos (\alpha+\beta)$ है,तो $\tan \alpha \tan \beta=$

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