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zerfon
@zerfon
September 2021
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Найти соs... | Много балов!!!
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marutand
Cos(a)=-sqrt(1-(4/5)^2)=-3/5; sin(b)=sqrt(1-(-15/17)^2)=8/17;
Cos(a+b)=(-3/5)*(-15/17)-4/5*8/17=13/85
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Answers & Comments
Cos(a+b)=(-3/5)*(-15/17)-4/5*8/17=13/85