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cos(-2pi/3)y+sin(-2pi/3)x= [cos(-2pi/3)x-sin(-2pi/3)y]^2, x from -10 to 10, y from -10 to 10
cos(-2pi/3)y+sin(-2pi/3)x= [cos(-2pi/3)x-sin(-2pi/3)y]^2, x from -10 to 10, y from -10 to 10
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