1 =9x(3x-y){3*x*(3x-y)+1}=9x(3x-y)(9xx-3xy+1)
2 = -(1/27)x^(2n)*{9xx+1-6x}= -(1/27)x^(2n)*(3x-1)(3x-1)
3 =2*(ax)^2+2*(by)^2+ (cx)^2+ (cy)^2=(2a^2+c^2)*x^2+(2b^2+c^2)*y^2.....
4 =2*x^n*[x^(n)-3y^2]^2
5=(x^n+1/2)^2-1/9*yy=(x^n+1/2+1/3*y)(x^n+1/2-1/3*y)
6 ={(x^2+y^2)-(y^2+z^2)}*{(x^2+y^2)^2+ (x^2+y^2)*(y^2+z^2)}+(y^2+z^2)}^2}+(z^2-x^2)^3
=3(x^2-z^2)[y^4+(xy)^2+(xz)^2+(yz)^2]
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