3xˇ2+5=5+27x
3xˇ2-27x=0, 3x(x-9)=0, x1=0,x2=9
2)q=a2/a1=a3/a2=a4/a3=.......
q=68/17=4,q=4
a4=a1.qˇ3
a4=17.4ˇ3=17.64=1088
Область определения данной функции х- любые
Sin(73π/24)*sin(37π/24)*sin(37π/12)=sin(3π+π/24)sin(π+13π/24)sin(3π+π/12)=
-sinπ/24*(-sin13π/24)*(-sinπ/12)=-1/2(cos(13π/24-π/24)-cos(13π/24+π/24))*
*sinπ/12=-1/2(cosπ/2-cos7π/12)*sinπ/12=1/2cos7π/12*sinπ/12=
=1/4(sin(π/12-7π/12)+sin(π/12+7π/12))=1/4(sin(-π/2)+sin2π/3)=
=1/4*(-1)+1/4*√3/2=-1/4+√3/8