Нужна . 6cos(4x-p/4)+6=0 log2 (x(во второй степени)-3х)=2

6Cos(4x-π/4)+6=0
cos(4x-π/4)=-1
4x-π/4=π+2πn
4x=5π/4+2πn
x=5π/16+πn/2,n∈z

Log2 (x²-3х)=2
{x²-3x>0⇒x(x-3)>0⇒x<0 U x>3
{x²-3x=4
x²-3x-4=0
x1+x2=3 U x1*x2=-4
x1=-1 U x2=4