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Question
Prove that:
Solution
\[\sqrt{\frac{1 - \sin\theta}{1 + \sin\theta}}\]
\[ = \sqrt{\frac{1 - \sin\theta}{1 + \sin\theta} \times \frac{1 - \sin\theta}{1 - \sin\theta}}\]
\[ = \sqrt{\frac{\left( 1 - \sin\theta \right)^2}{1 - \sin^2 \theta}}\]
\[ = \sqrt{\frac{\left( 1 - \sin\theta \right)^2}{\cos^2 \theta}} \left( \cos^2 \theta + \sin^2 \theta = 1 \right)\]
\[= \frac{1 - \sin\theta}{\cos\theta}\]
\[ = \frac{1}{\cos\theta} - \frac{\sin\theta}{\cos\theta}\]
\[ = \sec\theta - \tan\theta\]
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