If t is a differentiable function, find an expression for the derivative of each of the following functions:

(a) y = x*t^2(x)
(b) y = x/t^2(x)
(c) y = t^2(x)/x

A) 2xt(x) + x^2t'(x)
B) 2xt(x) - x^2t'(x)
C) xt(x) + x^2t'(x)
D) xt(x) - x^2t'(x)