Question

Use the Pythagorean identity

to find sin x.
COS X =
sin x =
31
3√13
19
2√[?]

Answer 1

2√61/19

Explanation:

sin^2 x = 1 - cos^2 x

= 1 - (3√13/ 19)^2

= 1 - 117/361

= 244/361

sin x = √244/19

= 2√61/19.