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- Homework Statement
- Let ##f(x,y)=\arctan(4\sin^2(y)+3\ln(x^2+1))## show that it has ##\infty## global minima

- Relevant Equations
- No relevant equations

I'm always struggling understand how to determine if a two variable function has global minima, I know that if I find a local minima and the function is convex than the local minima is also a global minima, in this case is really difficult to determine if the function is convex.

Sorry if I don't post any attempt but I got no clue how to do this.

Sorry if I don't post any attempt but I got no clue how to do this.