(Choose 1 answer)
(See picture)
A. (iv)
B. (iii)
C. (i)
D. (ii)
E. None of the other choices is correct
x²+1 Let f(x) = x + cos(t) tdt. Find f'(x).
(i) (x²+1) (t² + 1) cos(t² + 1)
(ii) (x²+1) cos(x² + 1)
(iii) (t2+1) cos(t² + 1)
(iv) 2 x(x²+1) cos(x² + 1)
