16. The function f (x) = ell is O continuous everywhere but not differentiable at I = 0 (O) Continuous and differentiable everywhere Not continuous at I = 0 () Neither continuous nor differentiable st I = 0) 17- If sec (7 - 4x)dx = atan(7 - 4z) + C, then value of a is 07 O -4 03 O -1/4 18. cos 0 cos 38 de is equal to O1 O 2/3 O 1/2 19. If f (z) = log (2 + v/1+ 2") the Of (z) + f ( -z) =1 Of(2) + f (-z) =0 Of(z) + f(-z) = 2f(=) Of(z) + f(-z) = 2f(-1)