(a^3-6a)^2 (a-x)^2(x+a)^2 100a^4-1/9b^2 9x^2-(x-1)^2 x^3+y^6
=a⁶-12a⁴+36a² =((a-x)(a+x))²=a⁴-x⁴ =(10a²-1/3b)(10a²+1/3b) =(3x-x+1)(3x+x-1)=(2x+1)(4x-1) =(x+y²)(x²-xy²+y⁴)