[R] solving equations with several variables

[Spencer Graves]

"optim"? 

Josh Schmidt wrote:

>I am relatively new to R, but I would like to use it find the values of b1 and 
>b2 that maximize the following equation:
>
>(sum(cos(x3+2.33474-2(atan(b1*x1+b2*x2)))))
>
>Any help would be greatly appreciated.
>
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