1-1, 1, -1, 0, 2, 9!, 1*2*3*4*5*6*7*8*9, 9+8+7+6+5+4+3+2+1, 99, 9*9, 1x2x3x4, 1*9, simplify x2-y2, (x+y)(x-y), (x-y)(x-y), simplify (x-y)2, x2-2xy+y2, (x-y)(x-y), simplify ((x2-y2)/(x-y)2)/((x-y)2/(x2+y2)), x2-y2, 1, X-Y, X+Y, ((x2+2xy+y2)/1)*(1-1/(x+y)2), 1, 0, x, y, 9-9, 1/99, 9/12, 92/1, 0, 5!, 120, 60, 240, 0, 5-5*55, 1, 0, 2+1, 3, 2.

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