Выразить x через y или наоборот
-2=-0.8х+6
0.8х=8
х=8/0,8
х=10
Х^2+рх+q=0
1)x1= -5. x2=7
(x+5)(x-7)=x^2-7x+5x-35=x^2-2x-35
q=-35
2)x1= -6. x2=4
(х+6)(х-4)=х^2-4х+6х-24=х^2+2х-24
q=-24
1) 2x = πk, k∈ Z,
x = πk/2 , k∈ Z
2)2x = (-1)^narcSin(1/2) + nπ, n ∈Z
2x = (-1)^n*π/6 + nπ, n ∈Z
x = (-1)^n*π/12 + nπ/2, n ∈Z
3) Sinx = √2/2
x = (-1)^narcSin√2/2 + nπ, n ∈Z
x= (-1)^n*π/4 + nπ, n ∈Z
4) Cosx = √2/2
x = +-arcCos√2/2 +2πk, k ∈Z
x = +- π/4 + 2πk , k ∈Z