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

Answer:
2√61/19
Step-by-step 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.