tgj=-4/3
cos^2j=1/(1+tg^2j)=1/(1+16/9)=1/(25/9)=9/25, cosj=-3/5
sin^2j=1-cos^2j=1-9/25=16/25, sinj=4/5
tgj=-4/3
cos^2j=1/(1+tg^2j)=1/(1+16/9)=1/(25/9)=9/25, cosj=-3/5
sin^2j=1-cos^2j=1-9/25=16/25, sinj=4/5