Consider the indefinite integral 5 sin(9x+1) dx: a) This can be transformed into a basic integral by letting u 9x+1 and du 9dx b) Performing the substitution yields the integral one. 9 cos (9x + 1) + C X syntax error. Check your variables - you might be using an incor c) Once we integrate and substitute, the final answer in terms of x is: cos (9x+1)+C