Question

3. (a) If cos 120° =-1/2 find the value of sin 120° and tan 120°.​

Answer 1

Answer:

$sin \: 120 \degree = sin \: (90 \degree + 30 \degree) \\ = cos \: 30 \degree \\ = \frac{ \sqrt{3} }{2} \\ \\ tan \: 120 \degree = tan \: (90 \degree + 30 \degree) \\ = - cot \: 30 \degree \\ = - \sqrt{3}$