7 3/16 - 2 6/16 = 4 13/16
4 13/16 + 5 8/16 = 10 5/16
42/16=21/13, 35/77=5/11, 48/60=4/5, 72/96=8/12=2/3, 56/70=8/10=4/5
72/90=36/45=4/5, 60/105=4/7, 45/150=3/10, 84/120=21/30=7/10,
96/100=24/25
Dy=dxy'
y'=2cosxsinx
y'(π/4)=2cosπ/4*sinπ/4=2*√2/2*√2/2=2*√4/4=√4/2=2/2=1
dy=0,02*1=0,02.
Так?