Question

if cos x=2/3 and x is in quadrant 4 then sin x /2=
- 1/3
1/3
-sqt1/6
sqt1/6

Answer 1

u mean
\(\large \sin (\frac{x}{2})\) or \(\Huge \frac{\sin x}{2}\) ??

Answer 2

the first one

Answer 3

@ikram002p

Answer 4

Does anyone know how to solve this :S

Answer 5

have you tried calculating what alpha is equal to, putting it into the cast diagram and finding out theta?

Answer 6

I don't know how to do that :/

Answer 7

on your calculator calculate the inverse sin of x and use the cast diagram to calculate what theta is equal to by cycling round the cast diagram

Answer 8

√(1/6)