(r^-3s^2t)^4
r^-3s^2t)^4
\((r^{-3}s^2t)^4\\ =r^{-3*4}s^{2*4}t^4\\ =r^{-12}s^{8}t^4\\ =\frac{s^{8}t^4}{ r^{+12} }\\ =\frac{s^{8}t^4}{ r^{12} }\\\)
