Okay, let's go through this step-by-step:
1) sin(A) = opposite/adjacent = BC/AB = 18/24 = 3/4
2) cos(A) = adjacent/hypotenuse = AB/AC = 24/30 = 4/5
3) tan(A) = sin(A) / cos(A) = (3/4) / (4/5) = 3/4
4) sec(A) = 1/cos(A) = 1/4/5 = 5/4
5) csc(A) = 1/sin(A) = 1/3/4 = 12/3
In simple terms:
sin(A) = 3/4
cos(A) = 4/5
tan(A) = 3/4
sec(A) = 5/4
csc(A) = 12/3
Let me know if you need more details.