| iperbole: | $x^2/9-y^2/4=1$ | about((x*x)/9- (y*y)/4,1)
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| circonferenza: | $x^2+y^2=4$ | about(x*x+y*y,4)
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| cerchio | $x^2+y^2<4$ | (x*x+y*y)<4
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| esterno cerchio | $x^2+y^2>4$ | (x*x+y*y)>4
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| ellisse: | $x^2/25+y^2/4=1$ | about((x*x)/25+(y*y)/4,1)
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| bande | $(1lexle2) vv (-7lexle-5)$ | (1<=x)&&(x<=2) || (-7<=x)&&(x<=-5)
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| circonferenza traslata | $(x-2)^2+(y-2)^2=1$ | about((x-2)*(x-2)+(y-3)*(y-3),1)
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| sinusoide in y | $(sin(y)-.3) lt x lt (sin(y)+.3)$ | (sin(y)-.3 < x)&&(x < sin(y)+.3)
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| fascio di rette | $y=mx+2; m=1,+1,+2,-3 $ | about(y,x+2)||about(y,2*x+2)||about(y,-x+2)||about(y,-3*x+2)
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| disequazione di secondo grado | $y > x^2$ | y > x*x
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| scacchiera primo quadrante | ${ (mod(x,2) < 1), ( mod(y,2) <1 ) , (x >0) , (y >0) :}$ | x%2 < 1 && y%2<1 && x>0 && y>0
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