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$(\cos \alpha + \cos \beta )^2 + (\sin \alpha + \sin \beta )^2 = $

$\cos 15^{\circ} - \sin 15^{\circ}$ का मान है ......

यदि $\theta+\phi=\frac{\pi}{4}$ है, तो $(1+\tan \theta)(1+\tan \phi)$ का मान क्या होगा?

यदि $\cos \theta = \frac{3}{5}$ और $\cos \phi = \frac{4}{5}$ है,जहाँ $\theta$ और $\phi$ धनात्मक न्यून कोण हैं,तो $\cos \frac{\theta - \phi}{2} = $

$\frac{\tan 70^o - \tan 20^o}{\tan 50^o}$ का मान ज्ञात कीजिए।

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