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'True' (सत्य) या 'False' (असत्य) लिखिए और अपने उत्तर का औचित्य बताइए।
$\cos \theta = \frac{a^{2} + b^{2}}{2ab}$,जहाँ $a$ और $b$ दो भिन्न संख्याएँ हैं ताकि $ab > 0$ हो।

सिद्ध कीजिए कि $\sin^{6} \theta + \cos^{6} \theta + 3 \sin^{2} \theta \cos^{2} \theta = 1$.

यदि $\tan \theta + \sec \theta = l$ है,तो सिद्ध कीजिए कि $\sec \theta = \frac{l^{2} + 1}{2l}$.

$\sin^{2} 60^{\circ} - \tan 45^{\circ} + \cos^{2} 30^{\circ} - \cot 90^{\circ} = \ldots$

$\cos \theta = \frac{b}{\sqrt{a^2 + b^2}}$; जहाँ,$0 < \theta < 90^\circ$; तो $\sin \theta = \dots$

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