I need some help with one of my tutorial questions. This is the question(adsbygoogle = window.adsbygoogle || []).push({});

http://img122.imageshack.us/img122/9820/ques3dd3.jpg [Broken]

For Part (a), I have found the partial derivatives as

Fx (x,y) = Cos(x) Sin(y)

Fy (x,y) = Sin(x) Cos (y)

Then to find the stationary points, Let Fx = 0 and Fy = 0. But im not sure how to find the values..

For Part (b), I have no idea how to solve it..

For Part (c), I know the chain rule for two variables but im not sure how to apply it to this question. If someone could point out an example that would be great =)

Thx for the help!

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Functions of Two Variables. Need Help!

**Physics Forums | Science Articles, Homework Help, Discussion**