sin a = 0.8
sin= y/R
cos=x/R
tan=x/y
cotan=y/x
R=1
y=0.8 = sin a
По пифагору
x=-sqrt(1-0.8^2)=-0.6 = cos а
tan(a)=sin(a)/cos(a)=0.8/0.6=-1-1/3
cotan(a)=cos(a)/sin(a)=-0.75
sin a = 0.8
sin= y/R
cos=x/R
tan=x/y
cotan=y/x
R=1
y=0.8 = sin a
По пифагору
x=-sqrt(1-0.8^2)=-0.6 = cos а
tan(a)=sin(a)/cos(a)=0.8/0.6=-1-1/3
cotan(a)=cos(a)/sin(a)=-0.75