Evaluate the integral. /2 sin 8 cos5 de Evaluate the integral. (Remember to use absolute values where appropriate. Use C for the constant of integration.) 13. 3 cosx tanx dx Submit Answer Evaluate the integral. (Use C for the constant of integration.) 6 tan x sec x dx Submit Answer Evaluate the integral. /2 7 sin(20) de Submit Answer Evaluate the integral. (Use C for the constant of integration.) 2 tan x sec x dx 1. Integrate the following using a regular u substitution: 2. You can integrate x4+x dx. sin (x) cos(x) dx using either of the substitutions u = sin x or u = cos x. One of the methods is more efficient than the other. Explain why this is the case, and integrate using the simpler substitution. 3. Integrate /cs csc (x) cot2(x) dx. Use the facts that csc (x) 1 + cot (x), da cot x = - csc (x) and csc x = CSC x cot x.