I have been having trouble with the ADVANCED portion of the chain rule and I would like some help on these.

Find the derivative of these equations

1. (sinx^2)(cosx^2) The answer comes out to be 2x cos2x^2

2. (x^3)(2-3x)^2. I know the first is 3x^2 and for the deriv. of the other one, it would be 2(2-3x)(2-3x)'-> (3x^2)(2(2-3x)-3). But the answer is 3x^2(2-3x)(2-5x).

3.(sqrt x^2+3/x^2-5) The answer comes out to (1/2)(x^2+3/x^2-5)^-1/2(-16x/(x^2-5)^2)