Find all solutions to the equation below for 0 lessthanorequ

Find all solutions to the equation below for 0 lessthanorequalto alpha lessthanorequalto 2 pi. If there is more than one answer, enter your solutions in a comma-separated list, and be sure to Give exact answers without any rounding. -2 cos (alpha) = 1 alpha = | Find all solutions to the equation with 0 lessthanorequalto alpha lessthanorequalto 2 pi. Give an exact answer if possible, otherwise Give value(s) of alpha accurate to at least four decimal places. 4 tan (alpha) + 5 = 2 alpha = |

Solution

1) -2*cos(a) = 1

       cos(a) = -0.5 =========> a = arccos(-0.5) = 120 = 2pi/3

2) 4*tan(a) + 5 = 2

      4*tan(a) = -3

      a = arctan(-3/4) =======> a = -36.87, 323.13