1) sin2X = 1/2 2) tan2 (X + pi/2) = 1 3) 5 - 3sec (X - pi/4) = -1
tan(x+pi/2) = -cot(x) 3sec(x-pi/4) = 6 sec(x-pi/4) = 2 cos(x-pi/4) = 1/2 x-pi/4 = pi/3 now just look in all the quadrants that work.
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