# Math Help - Extrem values

1. ## Extrem values

I have absolutely no idea what to do..

Give, in exact form, the coordinates for the maxpositions in this curve:

$y = 2 sin x - x$

In the intervall $0 < x < 2 pi$

You have to excuse my incorrect english and grammar...

Best Regards

2. Ffind the derivative of y with respect to x and equate to zero. Find he value of x.

y = 2sin(x) - x.........(1)
dy/dx = 2cos(x) - 1 = 0
cos(x) = 1/2.
Now find all possible values of x.
Substitute the values of x in eq.(1) to get the y values.

3. Aha!

Thx a million