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plot x - 1 - 0.5 * sin(x) - (-1.5 + x + (x - pi/2)^2/4 - (x - pi/2)^4/48), x=0..pi
plot x - 1 - 0.5 * sin(x) - (-1.5 + x + (x - pi/2)^2/4 - (x - pi/2)^4/48), x=0..pi
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