The equation is;
Differentiating this equation with respect to Ajt...-kadai.png

This is proof problem of Economics. The answer should be Ajt = Bjt^x・Cjt^y・Djt^z, where x, y, and z should be expressed with a,b, and c (and M?), but I am not sure. This proof is difficult for me so please anyone help me.

Thanks in advance