Question

In triangle ABC, angle C is the right angle. Which statement is always true? A. Sin(A)=cos(A)

Answer 1

The answer is B. Sin(A)=cos(B).

Answer 2

Given this, we know:
A+B+90° = 180°
Therefore:
90°-A = B and 90°-B = A
We also know:
sin(A) = a/c
cos(B) = a/c

therefore,
Sin (A)=Cos (B)