3. Write arithmetic expression in C++ for the each of the following. Use appropriate library function if you need to. a) V = 4/4(3.1416r3) b) S = 2(3.1416r2) + 2 (3.1416r)h c) root = (-b + )/(2a) d) y = tan-1(a/b) e) z = ln(xy) + y2.5