Question

simplifique Y=tg X. cotgx

Answer 1

y= tgx . cotgx
y= sen y/cosy . cos y/sen y
y=1

RESPOSTA: y=1

Answer 2

tgx = senx / cosx

cotgx = cosx / senx 

Então:

y = tgx*cotgx

y = senx / cosx * cosx / senx

y = senx*cosx / senx*cosx

y = 1