150
Express $\cos A$ and $\tan A$ in terms of $\sin A$.
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$\cos A = \sqrt{1 - \sin^2 A}$ (1 Mark)
$\tan A = \frac{\sin A}{\cos A} = \frac{\sin A}{\sqrt{1-\sin^2 A}}$ (1 Mark)
$\tan A = \frac{\sin A}{\cos A} = \frac{\sin A}{\sqrt{1-\sin^2 A}}$ (1 Mark)