यदि $\sin \theta + \sin^2 \theta = 1$ है,तो $\cos^2 \theta + \cos^4 \theta = \dots$

  • A
    $1$
  • B
    $\cos^2 \theta \cdot \sin^2 \theta$
  • C
    $2$
  • D
    $1 + \cos^2 \theta$

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सिद्ध कीजिए कि $\frac{\cot A - \cos A}{\cot A + \cos A} = \frac{\operatorname{cosec} A - 1}{\operatorname{cosec} A + 1}$.

निम्नलिखित सर्वसमिका को सिद्ध कीजिए,जहाँ कोण न्यून कोण हैं जिनके लिए व्यंजक परिभाषित हैं:
$(\operatorname{cosec} A - \sin A)(\sec A - \cos A) = \frac{1}{\tan A + \cot A}$

सिद्ध कीजिए कि,
$1 + \frac{\cot^{2} \alpha}{1 + \operatorname{cosec} \alpha} = \operatorname{cosec} \alpha$

$\tan 23^{\circ} \tan 42^{\circ} \tan 48^{\circ} \tan 67^{\circ} = \ldots \ldots \ldots \ldots .$

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

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