(9) Let \( f(x, y) = xe^x - ye^x \). The gradient of \( f \) at \( (0, 0) \) is \( \nabla f(0, 0) = \)________
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(9) Let \( f(x, y) = xe^x - ye^x \). The gradient of \( f \) at \( (0, 0) \) is \( \nabla f(0, 0) = \)________