Chapter 16.1, Problem 34E

Double integrals Evaluate each double integral over the region R by converting it to an iterated integral.

34. ${\displaystyle \int {\displaystyle \underset{R}{\int }}}$cos (x $\sqrt{y}$) dA; R = {(x, y) : 0 ≤ x ≤ 1, 0 ≤ y ≤ π²/4}