# Math Help - stationary points

1. ## stationary points

hi

i have two values of x calculated from previous question

and

i put them into
to find stationary points for the function of g(x)

cos and cos both give me .

put and into and come up with nice answer e^1/3.

but as i have two values of x i must have two points but i must be wrong as they are at the same coordinate

any help would be great

2. Originally Posted by smartcar29

cos and cos both give me .
$\cos\left(\frac{\pi}{6}\right) = \frac{\sqrt{3}}{2}$

$\cos\left(\frac{5\pi}{6}\right) \neq \frac{\sqrt{3}}{2}$

Which quadrant in the unit circle does $\frac{5\pi}{6}$ live?

What do you know about $\cos(x)$ there?

3. ah it is clear to me now is it $\frac{-\sqrt{3}}{2}$ many thanks to you sir. have a good day down under

many thanks