Calculas! 30 points! evaluate ∫ sin 4x cos2 4x dx.

Solve with substitution:

Let u = cos^2(4x)
du = -8sin(4x) cos(4x) dx

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.