- $(1/3a^5 - 1/2a^2)(1/3a^5+1/2a^2)$
- $(x-1/2y-1)(x-1/2y+1)$
- $(-4x^2+y^4)^2$
- $(0.5a^2+0.bar(3) b^4)^2$
- $(2x-y-3/2)^2$
- $(a^(2x) - a^x - 1)^2$
- $(2/3a^2-3b)^3$
- $(-3x-y^2)^3$
- $[(2a^2b-c)*(2a^2b+c)-(2a^2b-c)^2+2c^2]:(-2ac)$
- $(x^3+x^2+1)^2 - (x^2+1)^3-x^2(2x^2+1)(x+1)+(-2x^2)^2$
- $(0.2x - 1)(0.2x+1)-(1/2x-1)^2+(x+1)^3-(x-1)^3-2/5x$
- $(a^(n+1) - a^n)^2-(a^(n+1) + a^n)^2+(a^(2n) + 2a)^2-[(a^n)^2]^2$