Question

Given sin x = -5/6 and x is in Quadrant IV, find cos 2x (1 point)

Answer 1

sinX = -5/6 = -.08333.

Xr = -56.44 Deg. = Reference angle.
X = -56.44 + 360 = 303.56 Deg.

cos(2X) = cos(607.1) = -0.38880.