(a-b)^4=a^4-4 a^3 b+6 a^2 b^2-4 a b^3+b^4
(2m-1)^4=1-8 m+24 m^2-32 m^3+16 m^4
(x+y)^6=x^6+6 x^5 y+15 x^4 y^2+20 x^3 y^3+15 x^2 y^4+6 x y^5+y^6
(a+2b)^6=a^6+12 a^5 b+60 a^4 b^2+160 a^3 b^3+240 a^2 b^4+192 a b^5+64 b^6
(a-b)^5=a^5-5 a^4 b+10 a^3 b^2-10 a^2 b^3+5 a b^4-b^5
(x-3)^5=-243+405 x-270 x^2+90 x^3-15 x^4+x^5
