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plot y sin 12x = x cos 2y, y = -3(x - pi/2) + pi/4 from x= pi/4 to pi, y = pi/8 to pi/2
plot y sin 12x = x cos 2y, y = -3(x - pi/2) + pi/4 from x= pi/4 to pi, y = pi/8 to pi/2
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