Find ALL solutions for theta in radian measure Find EXACT VA

Find ALL solutions for theta, in radian measure. Find EXACT VALUES; otherwise provide at least plusminus 0.0001 accuracy. including reference angle. A. cos theta = -5/7 b. 5 sin theta - sin theta tan theta = 0

Solution

Cos theta=5/7

Theta=cos^-1(5/7) = 44.4153 degree,315.5847degree=.7752 radian,5.5080radian

Reference angle = .7752 radian