1
sin(-7π/4)=-sin(2π-π/4)=sinπ/4=√2/2
cos(-7π/4)=cos(2π-π/4)=cosπ/4=√2/2
tg(-7π/4)=-tg(2π-π/4)=tgπ/4=1
sin(-4π/3)=-sin(π+π/3)=sinπ/3=√3/2
cos(-4π/3)=cos(π+π/3)=-cosπ/3=-1/2
tg(-4π/3)=-tg(π+π/3)=-tgπ/3=-√3
sin(-5π/6)=-sin(π-π/6)=-sinπ/6=-1/2
cos(-5π/6)=cos(π-π/6)=-cosπ/6=-√3/2
tg(-5π/6)=-tg(π-π/6)=tgπ/6=1/√3
sin(-5π/3)=-sin(2π-π/3)=sinπ/3=√3/2
cos(-5π/3)=cos(2π-π/3)=cosπ/3=1/2
tg(-5π/3)=-tg(2π-π/3)=tgπ/3=√3
2
cosπ=-1
sin(-π/6)=-1/2
sin(-π/3)=-√3/2
cos(-π/6)=√3/2
3
sint*cost*sint/cost=sin²t
sint*cost*ctgt-1=cos²t-1=-sin²t