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Thanks! I get it now, was confused on whether the A and B were variables or not. Thanks!It's pretty straightforward. I'll do the first one for you. We have $y_k=Aak^{a-1}$ (because the other term doesn't have a $k$ since it's the partial derivative), and $y_k$ denotes the partial derivative respecto to $k.$
Try the other one and substitute.