Answer:
cos(C)
Step-by-step explanation:
As you can see in the picture I attached, the angles are in capital letters and the lowercase letters are the sides of the triangle. This is a basic ABC set up for a triangle.
Sine is equal to the opposite side of the angle/the hypotenuse (the long diagonal side).
Cosine is equal to the adjacent side of the angle (the one attached to it)/the hypotenuse (the long diagonal side).
Tangent is equal to the opposite side of the angle/the adjacent side of the angle.
In this case, sin(A) would equal (a/b) and cos(C) would also equal (a/b), so they're equal.
