Question

$\cos A=\frac{4}{5}$ , find $\tan A$

Answer 1

Solution:

$\cos A=\frac{4}{5}$

Using ${\cos }^{2}A+{\sin }^{2}A=1$

$\sin A=\frac{\pm 3}{5}$

So, $\tan A=\frac{\pm 3}{4}$