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यदि $\left[1-\cos \left(\frac{\pi}{2}+\alpha\right)+\sin \left(\frac{3 \pi}{2}+\alpha\right)\right]^2+\left[1-\sin \left(\frac{3 \pi}{2}-\alpha\right)-\cos \left(\frac{3 \pi}{2}+\alpha\right)\right]^2=a+b \sin ^2\left(\frac{\pi}{4}+\alpha\right)$,तो $a^2+b^2=$

यदि $\sec \theta = \frac{13}{12}$ और $\theta$ चौथे चतुर्थांश ($4^{\text{th}}$ quadrant) में स्थित है,तो $\tan \theta \times \operatorname{cosec} \theta \times \sin \theta \times \cos \theta = $

निम्नलिखित डिग्री माप के संगत रेडियन माप ज्ञात कीजिए: $520^{\circ}$

$\sin 690^{\circ} \times \sec 240^{\circ} = $

$\frac{\sin x}{1+\cos x} + \frac{1+\cos x}{\sin x} = ?$

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