помогите решить 5 и 3 номер (помеченные красным)
3
cos(pi+t)=cospi*cost-sinpi*sint=-1*cost-0=-cost=-√(cost^2)=-√(1-sint^2)=
=-√(1-16/25)=-√(9/25)=-3/5
5
tg(β+pi/3)=2√3
(tgβ+tg(pi/3) )/(1-tg β*tg(pi/3))=2√3
tgβ+√3=(1-tg β*√3)*2√3
tgβ+√3=2√3-6tg β
tgβ=√3
tgβ=√3 /7
ctgβ =7/√3=7√3/3
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3
cos(pi+t)=cospi*cost-sinpi*sint=-1*cost-0=-cost=-√(cost^2)=-√(1-sint^2)=
=-√(1-16/25)=-√(9/25)=-3/5
5
tg(β+pi/3)=2√3
(tgβ+tg(pi/3) )/(1-tg β*tg(pi/3))=2√3
tgβ+√3=(1-tg β*√3)*2√3
tgβ+√3=2√3-6tg β
tgβ=√3
tgβ=√3 /7
ctgβ =7/√3=7√3/3