Use the Substitution Formula, ngon) .g'(x) dx= Ku) du where gix) = u, to evaluate the following integrals 412 Ox dx b. 4+4 -4.F VX- +4 412 a. 1x2 + 4 = dx = (Simplify your answer.) dy Find dx for the following integral. sin x dt y = dy = dx (Simplify your answer.)