tg A = (4-(-4))/7 = 8/7
tg B = (4-(-4))/2 = 4
tg C = tg(1+2) =( tg(1)+tg(2))/(1-tg(1)*tg(2)) = (7/8 +2/8)/(1-7/8*2/8)= (9/8) /(64-14)*64= 9*64/(8*50)= 9*8/50=
36/25
tg A = (4-(-4))/7 = 8/7
tg B = (4-(-4))/2 = 4
tg C = tg(1+2) =( tg(1)+tg(2))/(1-tg(1)*tg(2)) = (7/8 +2/8)/(1-7/8*2/8)= (9/8) /(64-14)*64= 9*64/(8*50)= 9*8/50=
36/25