-4/5
Объяснение:
sin(a-b)=sinacosb-sinbcosa=-0,8*7/25-(24/25)*0,6=
=-(4/50*7/25+72/(25*5))=-(72+28)/25*5=-100/25*5=-4/5
1-0,64=0,36
sina<0 cosa<0
cosb>0 sinb<0
1-49/625=576/25
-4/5
Объяснение:
sin(a-b)=sinacosb-sinbcosa=-0,8*7/25-(24/25)*0,6=
=-(4/50*7/25+72/(25*5))=-(72+28)/25*5=-100/25*5=-4/5
1-0,64=0,36
sina<0 cosa<0
cosb>0 sinb<0
1-49/625=576/25