(a^2 - 36)(a^2 + 36) - (a^4 - 36a^2 + 324) =
= a^4 - 1296 - a^4 + 36a^2 - 324 =
= 36a^2 - 1620 =
= 36(a^2 - 45)
36* (1/36 - 45) = 1 - 45*36 = - 1619
Делим на 3 обе части уравнения. получаем:
х-3у=1/3
Y`=-sinx+√3cosx-0
2(√3/2cosx-1/2sinx)=0
sin(π/3-x)=0
π/3-x=πn
x=π/3+πn
x=π/3∈[-π/2;π/2]
- 8b + 3x - 10x + 20b =
= 12b - 7x