tana^2 = sin(2a)
tried everything... -_-
nah i just said i changed the right side to tan by multiplying top and bottom by cosa^2
so 0,pi/4, pi, 5pi/4 r my solutions since
tana = 0 , a can only equal = {0, pi} in the interval i was given
tana = 1, a can only equal = (5pi/4, pi/4} in the interval between 0 and 2pi noninclusive