Question

Sendo sen x = -1/3, com π3 π
2, ache cos x.

Answer 1

Resposta:

____________|

cosx=3/5

____________|

senx^2+cosx^2=1

senx^2=1-cosx^2

senx^2=1-(3/5)^2

senx^2=1-9/25

senx^2=25-9/25

senx^2=16/25

senx=√16/25

_________|

senx=4/5

_________|

tgx=senx/cosx

tgx=4/5÷3/5

tgx=4/5×5/3

tgx=20/15

__________|

tgx=4/3

Explicação passo a passo:

espero ter ajudado!