Solve the equation for solutions over the interval 0 degree

Solve the equation for solutions over the interval [0 degree, 360 degree). 6tan^2 theta¸ cos theta + 3 tan^2 theta = 0 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. The solution set is (Type your answer in degrees. Do not include the degree symbol in your answer. Round to one decimal place as needed. Use a comma to separate answers as needed.) B. The solution is the empty set.

Solution

6 tan²theta cos theta+3 tan² theta=0

3tan²theta(2cos theta+1)=0

tan theta=0 , cos theta=-1/2

theta=0°,120°, 180°,240°