38. (C)
To find a, the point of intersection of y = x^2 and y = cos (x), use your calculator to solve the
equation x^2 − cos (x) = 0. (Store the value for later use; a ≈ 0.8241.)
As shown in the diagram above, ΔA = (cos (x) − x^2 ) Δx.
Evaluate the area: