Question

Angle A is the complement of angle B.

​Which equation about the two angles must be true?

A) cos B = sin B
B) sin A = sin B
C) cos A = sin B
D) sin A = cos A

Answer 1

Answer:C

Step-by-step explanation:A is complement of B: A+B=90⁰

Answer 2

C) cos A=sin B

Explanation:

A is complement of B: A+B=90⁰

Sin(A)=sin(90-B)=cos(B)

Cos(A)=cos(90-B)=sin(B)

So c)