2cos3xCos2x+2sin^2x=1
Cos3xCos2x+1-cos2x=1
Cos2x(cos3x-1)=0
Cos2x=0 или Cos3x=1
X=п/4+Пn/2 X=2Пn/3
-2/5 х + 6 = 1/2 (х-1) домножаем на 10
7x²-0.35x=0
0.35x(20x-1)=0
x=0 20x-1⇒x=1/20=0.05
(9x^2-6x+1)(8b+1)-7b+21bx+3+9x=72x^2b+9x^2-48bx-6x+8b+1+-7b+21bx+3+9x=72x^2b+9x^2-37bx+3x+b+4