Question

me ajudem questão de PG

Answer 1

tgx=2/3

senx/cosx=2/3
3senx=2*cosx
cosx=3senx/2

cos²x+sen²x=1
9sen²x/4+sen²x=1
9sen²x+4sen²x=4
13sen²x=4
sen²x=4/13
senx=-2 √13/13

letra C

:)