64a³-27b⁶=(4a)³-(3b²)³=(4a-3b²)((4a)²+(4a)*(3b²)+(3b²)²=
=(4a-3b²)(16a²+12ab²+9b⁴)
(3n+2)³+(4n+5)³= (3n+2+4n+5)((3n+2)²-(3n+2)(4n+5)+(4n+5)²)=
=(7n+7)((3n+2)²-(3n+21)(4n+5)+(4n+5)²)=
=7(n+1)((3n+2)²-(3n+2)(4n+5)+(4n+5)²).
3.52 ( 2.04 - 1.04) + 0.48 = 3.52 * 1 + 0.48 = 3.52 +0.48 = 4
Sin²d-sin²d*cos²d=sin²d*(1-cos²d)=sin²d*sin²d=sin⁴d.