Using an inverse trigonometric function find the solutions o

Using an inverse trigonometric function find the solutions of the given equation in the indicated interval. Round your answers to two decimal places. (Enter your answers as a comma-separated list.) 42 cos^2(x) + cos(x) -1 = 0, [0, pi]

Solution: Factor of the equation (7cos x-1)(6cos x+1)=0

x = 81.78679^o, 99.59407^o