સાબિત કરો કે,$\tan \theta + \tan (90^{\circ} - \theta) = \sec \theta \sec (90^{\circ} - \theta)$

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(N/A) ડા.બા. $= \tan \theta + \tan (90^{\circ} - \theta)$
કારણ કે $\tan (90^{\circ} - \theta) = \cot \theta$,તેથી:
$= \tan \theta + \cot \theta$
$= \frac{\sin \theta}{\cos \theta} + \frac{\cos \theta}{\sin \theta}$
$= \frac{\sin^2 \theta + \cos^2 \theta}{\sin \theta \cos \theta}$
કારણ કે $\sin^2 \theta + \cos^2 \theta = 1$,તેથી:
$= \frac{1}{\sin \theta \cos \theta}$
$= \frac{1}{\cos \theta} \cdot \frac{1}{\sin \theta}$
$= \sec \theta \operatorname{cosec} \theta$
કારણ કે $\operatorname{cosec} \theta = \sec (90^{\circ} - \theta)$,તેથી:
$= \sec \theta \sec (90^{\circ} - \theta) = \text{જ.બા.}$

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