Question

2) (c^3-d^3)*(c^3+d^3)
4) (c^4+d^2)*(c^4-d^2)
6) (1,4c-0,7a^3)*(1,4c+0,7a^3)

Answer 1

с^6-d^6
C^16-d^4
1,96c^2-0,49a^6