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plot sin(pi x) - 2*(( (x*2)^2 * .0363551 - .3216147) * (x*2)^2 + .7853134)*(2x), sin(pi x) - 2*(( (x*2)^2 * pi^5/(32*2*120) - pi^3/(8*2*6)) * (x*2)^2 + pi/4)*(2x) from 0 to 0.5
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