Let S be the triangular region whose vertices are (0, 0), \(\left(0, \frac{\pi}{2}\right)\), and \(\left(\frac{\pi}{2}, 0\right) \) of \(\displaystyle \iint_S\) sin(x) cos(y) dx dy is equal to __________.
(rounded off to two decimal places)
Enter numerical value using the virtual keypad. Round off where necessary.