1. sin(tan^-1(4/3))=4/5

Question

2. find the angle whose tangent equals 0.
tan^-1(cos(pi/2))=0

Answer 1

both are correct, but I think the answer to #2 does not relate well to the question.

I'd have said tan^-1(0) = 0 since tan(0) = 0

Answer 2

courtney has a three digit cards.

they are 6 8 and 3.

what is the largest number that courtney can write using these digit cards?