<p>Prove the following identities.</p>
<ol class="i-list"><li data-list-item-id="item-i"><div class="list-item-content"><span class="list-item-text">\(\tan \left( A - \frac{\pi}{4} \right) = \frac{\sin A - \cos A}{\sin A + \cos A}\)</span></div></li><li data-list-item-id="item-ii"><div class="list-item-content"><span class="list-item-text">\(\sec \left( \frac{\pi}{2} + A \right) = -\operatorname{cosec} A\)</span></div></li></ol>

\(\tan \left( A - \frac{\pi}{4} \right) = \frac{\sin A - \cos A}{\sin A + \cos A}\)

\(\sec \left( \frac{\pi}{2} + A \right) = -\operatorname{cosec} A\)

Trigonometry - Compound and Double-Angle Identities

Trigonometry - Compound and Double-Angle Identities

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