Ответ:
1) x^2-8(x-3)=24
x^2-8+24=24
x^2-8=0
x(x-8)=0
x=0
x-8=0
x=8
X1=0,X2=8
2)(2x-1)(3x+1)+x(1-2x)=0
6x^2+2x-3x-1+x-2x^2=0
4x^2 +0-1=0
4x^2=1
x1=-1/2
x2=1/2
sina=V(1-cos^2a)=V(1-0.64)=V0.36=0.6