Question

It's precalc!!! The Pythagorean identity. Value of sin(θ1)?

Answer 1

sqrt(217)/19

Explanation:

sin²(theta) = 1 - cos²(theta)

= 1 - (-12/19)²

sin²(theta) = 217/361

sine is positive in quadrant 2

Take the positive root

sin(theta) = sqrt(217)/19