Question

Sabendo que cos x =4/5 e x é do primeiro quadrante, calcule sen x, tg x, cotg x, sec x e cossec x

Answer 1

senx =√1-cos²x = √1 -16/25=√9/25= 3/5

tgx=senx/Cosx= 3/5 / 4/5 = 3/5*5/4= 3/4

cotgx = 1/tgx = 4/3

secx = 1/Cosx = 5/4

cossecx = 1/senx = 5/3