Question

Let ∠X and ∠Y be complementary. If sin(X) = 3/5

and cos(X) = 4/5. then what is the value of sin(Y)?
A)3/5
B)4/5
C)5/4
D)5/3

Answer 1

answer is B.

Explanation:

Answer 2

Since they are complementary
x + y = 90

Sin(o) = Cos (90-0)

Therefore, Cos x = Sin y = 4/5 [ Because x and y are complementary]