Question

I need help solving these two equations:

http://i57.tinypic.com/9r0l00.jpg

Answer 1

\(\sin\left(\cot^{-1}\left(\dfrac{3x}{5}\right)\right)\)

Never struggle with these. Just draw a Right Triangle and designate an acute angle.

Answer 2

This reduces the problem to two things:

1) What is sin(A)?
2) Did we forget what quadrant we were in, since a Right Triangle always implies Quadrant I?