V=π*$(sin²x)dx=π*$(1-cosx)/2dx=
π*1/2(x-sinx)( 0 π)=
π/2(π+0)=π²/2
= - sin 1 = -П/2
..................................
Log4(x+1)<-1/2
log4(x+1)<log4(1/2)
x+1<1/2
x<1/2-1
x<-1/2
1) q=b2/b1=1/sqrt(2)
S=b1/(1-q)=sqrt(2)/(1-1/sqrt(2))=sqrt(2)/((sqrt(2)-1)/sqrt(2))=2/(sqrt(2)-1)=2(sqrt(2)+1)=2sqrt(2)+2
2)b5=b1*q^4
sqrt(2)/16=b1*(1/2)^4
sqrt(2)/16=b1/16
b1=sqrt(2)
S=sqrt(2)/(1-1/2)=2sqrt(2)