(a) Solve d -COS X dx x2 sin 't dt , where 0

d cos x Solve sm dx x2 much as possible. -It dt , where 0 < x < 1 (b) Detennine the derivative of f(x) In tanl x x+l , simplifying your answer as (9 marks) (8 marks) d cos x Solve sm dx x2 much as possible. -It dt , where 0 < x < 1 (b) Detennine the derivative of f(x) In tanl x x+l , simplifying your answer as (9 marks) (8 marks)