(b) [4] Using the tools covered in this course, find g'(x) where, x 2t g (x ) = cos(1x2) 5 + t2 + +80 at 3.(a)[3] Use the substitution u = tan x to evaluate S tan x sec2x dx (b)[3]Use the substitution u = sec x to evaluate Stan x sec2x dx (c)[1] Looking at the results from (a) and (b) above, which is the correct approach? (d) [4] Use the substitution, u = sin 0, in the integral below to produce a new integral dependent on u only. You might find the triangle on the right useful. 1/ 6 f (sin 0) de = u VI-42