How can i find max & min of this 2 variables function?

Hi friends,i have a problem,How can i find max & min of this 2 variables function with matlab? can you help me please?!

f(x1,x2)=cos(x1+x2)*sin(x2)+(3*cos(x1+x2)-6*cos(x2))*cos(x2)*sin(x2)

[Walter Roberson]

Analytically or numerically?

[Mohammad]

Hi,Dear Walter,i need numerically solution.

Answer 1

[Bjorn Gustavsson]

Have a look at the chebfun project: http://www.mathworks.se/matlabcentral/fileexchange/23972-chebfun. There are brilliant functions there to do that for this type of problem. Brilliant meaning that it doesn't get stuck in local minima like fminsearch et al. might.