If cos 71° = A then sin?=A

19°

Step-by-step explanation:

Draw a reference triangle, with one angle being 71°, then fill in the other angle because triangles have to add up to 180. 180-90-71=19. 19 is your missing angle because sin is opp/hyp.

Step-by-step explanation:

hello:

let this value : y

you have : cosx=siny = A

cosx=siny means : y = 90°-x x = 71°

so : y = 19°