Question

If sin y° = 9/c. and tan y° = 9/d. ,what is the value of cos y°?

Answer 1

use the identity tan y = sin y / cos y

so plug in the given values for the sin and the tan and fond the cos

Answer 2

tan y = sin y / cos y
cross multiply
tan y cos y = sin y
divide both sides by tan y;-
cos y = sin y / tan y

now plug in the given values to find cos y

Answer 3

Please try to apply this identity:
\[\cos x = \frac{{\sin x}}{{\tan x}}\]