pozalyjsta pomogite!
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a)sin945(gr)
b)tg(-7/3п)
c)cos7/6п
d)ctg210(gr)
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pozalyjsta pomogite!
viceslite
a)sin945(gr)
b)tg(-7/3п)
c)cos7/6п
d)ctg210(gr)
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Answers & Comments
а)sin945=sin(720+225)=sin225=sin(180+45)=-sin45=-√2/2
б)tg(-7п/3) =tg(п/3-2п)=tg(п/3)=√3
в)сos(7п/6)=сos(п+п/6)=-сos(п/6)=-√3/2
г) сtg210=ctg(180+30)=ctg30=√3