Question

Answer check!!

Answer 1

I choose A

Answer 2

i got this, but i wouldn't bet more than $14 that the answer is correct
http://www.wolframalpha.com/input/?i=integral+0+to+pi+%2F3+of+pi*sec^2%28x%29

Answer 3

at least it matches up with one of your choices

Answer 4

it does and it look correct me me

Answer 5

k good

Answer 6

could have done this without the calculator since the anti derivative of \(\sec^2(x)\) is well known