1)tg2x+tg3x/1-tg2x tg3x 2)tg5x-tg2x/1+tg2x tg5x
Tg(x+y)= (tgx + tgy)/(1-tgx tgy) tg(x-y)= (tgx - tgy)/(1+tgx tgy) 1) (tg2x+tg3x)/(1-tg2x tg3x) = tg(2x+3x)= tg 5x 2) (tg5x-tg2x)/(1+tg2x tg5x) = tg (5x-2x)= tg 3x