निम्नलिखित का मूल्यांकन कीजिए:
$\frac{\cos 45^{\circ}}{\sec 30^{\circ}+\operatorname{cosec} 30^{\circ}}$

  • A
    $\frac{3\sqrt{2}-\sqrt{6}}{8}$
  • B
    $\frac{\sqrt{6}-\sqrt{2}}{8}$
  • C
    $\frac{3\sqrt{2}+\sqrt{6}}{8}$
  • D
    $\frac{\sqrt{6}+\sqrt{2}}{8}$

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मान ज्ञात कीजिए:
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सिद्ध कीजिए कि $\sec A(1-\sin A)(\sec A+\tan A)=1$.

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यदि $15 \cot A = 8$ है,तो $\sin A$ और $\sec A$ का मान ज्ञात कीजिए।

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सिद्ध कीजिए कि:
$(i)$ $\tan 48^{\circ} \tan 23^{\circ} \tan 42^{\circ} \tan 67^{\circ} = 1$
$(ii)$ $\cos 38^{\circ} \cos 52^{\circ} - \sin 38^{\circ} \sin 52^{\circ} = 0$

त्रिभुज $ABC$ में,जिसका कोण $B$ समकोण है,यदि $\tan A = \frac{1}{\sqrt{3}}$ है,तो निम्नलिखित का मान ज्ञात कीजिए:
$(i)$ $\sin A \cos C + \cos A \sin C$
$(ii)$ $\cos A \cos C - \sin A \sin C$

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