Question

tg (pi +x)tgx determine

Answer 1

Sabemos que:

tg (a + b) = (tg a + tg b)/(1 - tg a.tg b)

Logo:

tg (π + x).tg x
[(tg π + tg x)/(1 - tg π.tg x)].tg x
[(0 + tg x)/1 - 0.tg x)].tg x
tg x.tg x = tg²x

Resposta: tg²x