Ответ:
1) sin(20+10)=1/2
2)cos(50-5)=cos45=√2/2
3)sin(71-11)=sin60=√3/2
4)cos(25+75)=cos90=0
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Ответ:
1) sin(20+10)=1/2
2)cos(50-5)=cos45=√2/2
3)sin(71-11)=sin60=√3/2
4)cos(25+75)=cos90=0