7cos2x + 3sin^2(2x) = 3
7cos2x + 3sin^2(2x) - 3 = 0
7 cos(2x) - 3cos^(2x) = 0
cos(2x) * (3cos(2x-7)) = 0
1) cos2x = 0
2x = π/2 + πn, n∈Z
x= π/4 + (πn)/2, n∈Z
2) 3cos(2x) 7
cos(2x) = 7/3
2x = c0s^(-1)(7/3) + πk, k∈Z
x2 = 1/2cos^(-1) (7/3) + πk, k∈Z
2x = 2πm - cos^(-1)(7/3) + πm, m∈Z
x3 = πm - (1/2)*cos^(-1)(7/3), m∈Z
= 2x+3x-8y=5x-8y
5-2a-7-10a=-12a-2
1.
1) 2x^5-10x^4+6x
2)3y^2-5y+6y-10=3y^2+y-10
3)14x^2+35xy-6xy-15y^2=14x^2-15y^2+29xy
4) x^3-x^2-2x-x^2+x+2=x^3-2x^2-x+2
2.
1)5y(3x-5y)
2)4a^4(3a-1)
3)a (6 + b) - (6 + b) y
3.
Делим на 7
x^2+3x=0
x(x+3)=0
x=0 или x+3=0 x=-3
4.
6m^2-3m-m^2+2m-3m+6=5m^2-4m+6