(5*sin5a*cos5a)/14cos5a=5sin5x/7= 0,7*5/7=0,5
1) 1-2t+t^2>3
1-2t>3
-2t>3-1
-2t>2
t<-1
2)m^2+9<1-2m+m^2
9<1-2m
2m<1-9
2m<-8
m<-4