The questions are in the photos below: I would like them all solved correctly.

Question 12 Not yet answered Marked out of 100 V Flag question Find the volume of the solid obtained when the region under the curvef(x) = cos(x) from x = 0 to x = the xaxis. Hint: You will find the following double angle formula useful: cos2 (x) = l l E + Ecosax) % is rotated about Question 11 Not yet Find the volume of the solid obtained when the region under the curve f (x) = x from x = 0 to x = 2 is rotated about the x- answered axis. Marked out of Volume = 1.00 Flag questionQuestion 9 Evaluate the following improper integral. Not yet answered 1 dx = Marked out of ( - 1) 4 1.00 Flag questionQuestion 10 Consider the following improper integral: Not yet answered dx Marked out of x 1.00 Does this integral converge? Flag question O(No answer given) OYes ONO