Question

Зная,что cosa4/5,sinb=-24/25 и 0<а<п/2, п

Answer 1

Сosa=4/5⇒sina=√1-16/25=3/5
sinb=-24/25⇒cosb=-√1-576/625=-7/25
10sin(a-b)=10(sinacosb-cosasinb)=10(-3/5*7/25+4/5*24/25)=
=10(-21/125+96/125)=10*75/125=10*3/5=6