Solve the equation algebraically, and then use a calculator to find the values on the interval  [0, 2π). Enter your answers as a comma-separated list. Round your answers to four decimal places.) 7 sin2(x) + sin(2x) sec(x) − 7 = 0   Find all exact solutions on [0, 2π). (Enter your answers as a comma-separated list.) 2 cos(3θ) = −1

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