Question

How do you solve `sin (Arccos (7/25))`?

Answer 1

`+-24/25`

Explanation:

Use `cos(-theta)=cos theta`.

Let `a = arc cos (7/25)`. The `cos a = 7/25`. a is in either 1st

quadrant or is in the fourth. Accordingly, the given expression

`sin a = +-sqrt(1-7^2/25^2)=+-24/25`. .