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The graphs of sine and cosine functions, intersect each other at a number of points and between two consecutive points of intersection, the two graphs enclose the same area $A$. Then $A^4$ is equal to ____.
Type: Numerical
$A = \int_{\pi/4}^{5\pi/4} (\sin x - \cos x),dx = 2\sqrt{2}$. $A^4 = (2\sqrt{2})^4 = 64$.
BETA
