1) (a-x) (b-8)
2) (a+b) (x-1)
3) (a-2b) (x+y)
4) (a+1) (x-y)
P.S. между скобками стоит знак умножения
sin(π/10 - x/2) = √2/2
π/10 - x/2 = (-1)^narcsin(√2/2) + πn, n∈Z
π/10 - x/2 = (-1)^n(π/4) + πn, n∈Z
x/2 = π/10 - (-1)^n(π/4) + πn, n∈Z
x = π/5 - (-1)^n(π/2) + 2πn, n∈Z
Х³+6х²-5х-30=(х³+6х²)-(5х+30)=х²(х+6)-5(х+6)=(х+6)(х²-5)
uz⁵+uy⁵-yz⁵-y⁶=(uz⁵+uy⁵)-(yz⁵+y⁶)=u(z⁵+y⁵)-y(z⁵+y⁵)=(z⁵+y⁵)(u+y)