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यदि $x = \sin 130^\circ \cos 80^\circ$,$y = \sin 80^\circ \cos 130^\circ$,और $z = 1 + xy$ है,तो निम्नलिखित में से कौन सा सत्य है?

$\tan 1^{\circ} \tan 2^{\circ} \tan 3^{\circ} \ldots \tan 89^{\circ}$ का मान क्या है?

$\cos 255^o + \sin 195^o$ का मान है

$\frac{1}{\cos 290^{\circ}}+\frac{1}{\sqrt{3} \sin 250^{\circ}} = $

$f(x) = \cos (x/3)$ का परिसर (range) क्या है?

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