Question: 17.1. A function of two variables is defined as f(x1,x2)-(cos2x? + cos2x2) 2 Sketch by hand or u the function at (xi, X2)-(0, 0), (xi,

17.1. A function of two variables is defined as f(x1,x2)-(cos2x? + cos2x2) 2 Sketch by hand or u the function at (xi, X2)-(0, 0), (xi, X2) = (1,-1), and (xi, X2)-(-1,1). Sketch the gradient vectors on the xi-x2 plane together with their respective iso-lines

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