Question

Tg x = -3 e pi/2 < x < pi entao senx . Cosx = ?

Answer 1

tgx=-3*π/2<x<π

tgx=-3*3,14/2<x<3,14

tgx=-3*1,57<x<3,14

tgx=-4,71<x<3,14

senx*cosx=

sen -4,71* cos -4,71=-0,08