$\frac{\cos (90^{\circ}- A ) \sin (90^{\circ}- A )}{\tan (90^{\circ}- A )}$ का सरलीकरण ....... है।

  • A
    $\sin ^{2} A$
  • B
    $\cos ^{2} A$
  • C
    $\sin A$
  • D
    $1$

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व्यंजक $\left[\frac{\sin ^{2} 22^{\circ}+\sin ^{2} 68^{\circ}}{\cos ^{2} 22^{\circ}+\cos ^{2} 68^{\circ}}+\sin ^{2} 63^{\circ}+\cos 63^{\circ} \sin 27^{\circ}\right]$ का मान ज्ञात कीजिए।

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यदि $2 \sin^{2} \theta - \cos^{2} \theta = 2$ है,तो $\theta$ का मान ज्ञात कीजिए। ($^{\circ}$ में)

$\sec 55^{\circ} \cdot \sin 35^{\circ} + \cos 35^{\circ} \cdot \operatorname{cosec} 55^{\circ} = \ldots \ldots \ldots \ldots$

यदि $A, B$ और $C$ एक त्रिभुज $ABC$ के अंतःकोण हैं,तो दर्शाइए कि $\sin \left(\frac{B+C}{2}\right) = \cos \frac{A}{2}$.

यदि $\cos (\alpha+\beta)=0$ है,तो $\sin (\alpha-\beta)$ को किसमें बदला जा सकता है?

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