I need solve this questions of calculus

Question 3 Not yet answered Question 4 Marked out of 5.00 Not yet answered Flag question Marked out of 5.00 Flag question Question [5 points]: To evaluate the integral Question [5 points]: The integral cost x sin' xdx we save one sine factor and use sin x = 1 - cos x to express the remaining in is improper. terms of cosine. Select one: Select one: O True O True O False O False Question 7 Question 8 Not yet answered Not yet answered Marked out of 5.00 Marked out of 5.00 Flag question Flag question Question [5 points]: Question [5 points]: The result of the integral To evaluate the integral 4 (x - 1 ) (x+ 1) -dx 7 =dx, V64 + x2 is equal to which of the following substitution should be used? Select one: O 2 1n x - 1 - 2In/x + 1/+c Select one: O In | x - 1 - In/x + 1|+c O x = 8 sec 0 O In | x - 1| - 2In/x + 1| +c O x = 8 tan 0 O 2 In x - 1|+ 2In/x + 1/+c O x = 8 sec 0 tan 0 O none of these O none of these