Question

How do you evaluate `Sin(Arctan 3)`?

Answer 1

`+-3/sqrt 10=+-0.9487`, nearly.

Explanation:

Let a = arc tan 3. Then tan a = 3 > 0.

So, a is in either 1st quadrant or in the 3rd.

Accordingly, the given expression `sin a = +-3/sqrt 10`