stationary points

**smartcar29** · September 15th 2009, 02:16 PM

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

**pickslides** · September 15th 2009, 02:31 PM

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?

**smartcar29** · September 15th 2009, 02:54 PM

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

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