Answer:
cos(L) = 12/13
Step-by-step explanation:
The hypotenuse of the triangle is LM = 13. The side adjacent to angle L is LN = 12. (It has L in the name.) The cosine is the ratio of the adjacent side to the hypotenuse:
Cos = Adjacent/Hypotenuse
cos(L) = LN/LM
cos(L) = 12/13
