Solve the equation for exact solutions over the interval [0, 2π). -2 sin^2x= sinx-1 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. The solution set is {___} (Type an exact answer, using a as needed. Type your answer in radians. Use integers or fractions for any numbers in the expression. Use a comma to separate answers as needed.) B. The solution is the empty set.