Respuesta :

Answer:

It's option C. 4/5

Step-by-step explanation:

Ver imagen manamoto13

Step-by-step explanation:

cosx=adjacent/hypotenuse

adj=3, hyp=5

by pythagoras theorem,

opp^2+3^2=5^2

opposite=4

sine=opp/hyp

sinex=4/5 (second quadrant so sin is positive)