Question

10. If tan = 4/3. Find coso if e lies in the first quadrant.
a) 5/4 b) 3/2 c)3/4 d3/5​

Answer 1

$\tan( \alpha ) = \frac{4}{3}$

${ \sec }^{2} \alpha = 1 + { \tan }^{2} \alpha$

$= 1 + \frac{16}{9}$

$\frac{25}{9}$

${ \cos }^{2} \alpha = \frac{9}{25}$

$\cos( \alpha ) = \frac{3}{5}$

p

Answer 2

The answer is option d) 3/5