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Plot {sin x, sqrt(2)/2, (1+x-pi/4)*sqrt(2)/2,sqrt(2)/2*(1+(x-pi/4)-(x-pi/4)^2/2)} from 0 to 1
Plot {sin x, sqrt(2)/2, (1+x-pi/4)*sqrt(2)/2,sqrt(2)/2*(1+(x-pi/4)-(x-pi/4)^2/2)} from 0 to 1
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