what is (2x)^(1/3)(x62y)6(1/3)
It's x^(x62y - 1) • x62y • 2^(x62y + 1)/3
At least, that is the derivative. There's no more simplifying that can be done.
Actually, I simplified it (if you can call this long number simplifying) so here it is: (6658042.581874427*x)*y
+165 +165 
