Question

please answer fast..........​

Answer 1

Answer:

Sin $\frac{x}{2}$ = - { $\frac{\sqrt{8+2\sqrt{15} } }{4}$}

Cos $\frac{x}{2}$ =  - { $\frac{\sqrt{8-2\sqrt{15} } }{4}$}

Step-by-step explanation: