Please show work and clear, asap please thank you.

Directions: To earn credit: Be neat and legible. Show all work when required. Express all numerical answers as integers or fractions where appropriate. 1. Solve by U-substitution. Do either part (a) or part (b) but NOT both. Show all work. 1el+1 dx (b) Jo extr ( sin(zx)dx (a) 1+cosix 2. Find the area enclosed by the region bounded by the curves. Do either part (a) or part (b) but NOT both. Show all work. (a) y = 9 - x2 and y = =x2 - 1 (b) y= -x3 + 5x and y = -2x over [-1,1]