a)√2sinπ/4cosa+√2cosπ/4sina-cosa-sina=√2*√2/2cosa+√2*√2/2sina-cosa-sina=
cosa+sina-cosa-sina=0
б)√2sinacos45-√2cosasin45-sina+cosa=√2*√2/2sina-√2*√/2cosa-sina+cosa=
sina-cosa-sina+cosa=0
в)2cos60cosa+2sin60sina-√3sina-cosa=2*1/2cosa+2*√3/2sina-√3sina-cosa=
cosa+√3sina-√3sina-cosa=0
г)√3cosa-2cosacos30-2sinasin30+sina=√3cosa-2*√3/2cosa-2*1/2sina+sina=
√3cosa-√cosa-sina+sina=0