Which relationship in the triangle must be true?
TE
sin(B) = sin(A)
sin(B) = cos(90 - B)
COS(B) = sin(180 - B)
COS(B) = cos(A)

Cosine stands for "complementary sine."  The sine of an angle is the cosine of the complementary angle and vice versa.  Complementary angles add to 90°.

sin(B) = cos(90 - B)

It's true for any angle, and it doesn't have much particularly to do with a triangle.

college

according to egenuity the answer is

step-by-step explanation:

d. 344.22