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vova2002959
@vova2002959
July 2022
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Помогите пожалуйста! До 4:00 по московскому времени я подожду
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TachiMeow
A) -sin(a)-sin(a)=-2sin(a)
б) -ctg(a)+ctg(a)=0
в) cos^2(a)-sin^2(a) +2sin^2(a)=cos^2(a)+sin^2(a)
г) (sin(a)-cos(a)*sin(a)+sin(a)+sin(a)*cos(a)) / (1+cos(a)*(1-cos(a))= 2sin(a)/(1-cos^2(a))= 2sin(a)/sin^2(a)= 2/sin(a)
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Answers & Comments
б) -ctg(a)+ctg(a)=0
в) cos^2(a)-sin^2(a) +2sin^2(a)=cos^2(a)+sin^2(a)
г) (sin(a)-cos(a)*sin(a)+sin(a)+sin(a)*cos(a)) / (1+cos(a)*(1-cos(a))= 2sin(a)/(1-cos^2(a))= 2sin(a)/sin^2(a)= 2/sin(a)