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Suppose that 0 < *c* < ????/2. For what
value of *c* is the area of the region enclosed by
the curves *y* =
cos(*x*), *y* =
cos(*x* ? *c*), and *x* =
0 equal to the area of the region enclosed by the
curves *y* =
cos(*x* ? *c*), *x* = ????,
and *y* = 0? (Note: These areas are in the
interval 0 ? *x* ? ????.)