Hello, my teacher recently handed us out a practice sheet in preparation for calculus next year in university. I am having a hard time understanding this question. Thank you in advance for answering 17) Please solve the following: a) with 13 on top at 7 on the bottom sin^2(7x)cos^2(7x)dx= b) (x+2/ x^2+4x +5) c) e^4xsin(4x)dx (the e is to the power of 4x) d) (dx/(4+x^2)^2) thank you in advance for your help