Question

Right triangle ABC is shown. Which of these is equal to cos(A)?

A) cos(B)
B) cos(C)
C) sin(B)
D) sin(C)

Answer 1

C).

Explanation:

Since angles A and B are complementary, their cofunctions are equal. So, cos(A) = sin(B).

Answer 2

Answer: C

cosA=AC/AB

sinB=AC/AB

hence cosA=sinB