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$9 \tan^2 \theta + 4 \cot^2 \theta$ का न्यूनतम मान क्या है?

यदि $\alpha+\beta+\gamma=2 \theta$ है,तो $\cos \theta+\cos (\theta-\alpha)+\cos (\theta-\beta)+\cos (\theta-\gamma)$ का मान ज्ञात कीजिए।

यदि $A+B+C=60^{\circ}$ है,तो $\cos (30^{\circ}-A)+\cos (30^{\circ}-B)+\cos (30^{\circ}-C)+\sin (A+B+C) = $

यदि $\cos(\sinh(\log x) + \cosh(\log x))$ का न्यूनतम मान $k$ है,तो $\cosh(k+1) =$

$\left(2 \cos^2 18^{\circ} - \sin 18^{\circ}\right) \left(\cos \theta + 3 \sqrt{2} \cos \left(\theta + \frac{\pi}{4}\right) + 3\right)$ का अधिकतम मान है

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