5. Evaluate the integral. Use u-sub and show step-by-step work. You must write explicitly what u and du are with your solution. π/2∫0 sin (1/3)x dx
6. Find the derivative of the function g(x) = x²∫1 sin(t) + cos(t) dt.
(HINT: use the first part of the Fundamental Theorem of Calculus)