8x-4(16-2x)
8x-64+8x
16x-64
1) а^3-3а^2б+3аб^2-б^3+а^3+3а^2б+3аб^2+б^3=2а^3+6аб^2=2а(а^2+3б^2)
2) м^3-3м^2+3м-1+м^3+3м^2+3м+1=2м^3+6м=2м(м^2+3)
1) sin 390 =sin(360+30)=sin30= 1/2
2) cos420=cos(360+60)=cos60=1/2
3) tg 540=tg(360+180)=tg180=0
4) ctg450=ctg(360+90)=ctg90=0
5) tg 7π/3 = tg(2π + π/3)=tg π/3 =√3
6) sin 11π/6 = sin(2π - π/6) = - sin π/6 = - 1/2
7) cos 9π/4 = cos(2π + π/4) = cos π/4 = √2/2
8) ctg 10π/3 = ctg (4π - 2π/3)= - ctg 2π/3 = -ctg(π - π/3) =ctg π/3 = √3/3