(1 point) Solve the following equations in the interval [0,2π]. Note: Give the answer as a multiple of π. Do not use decimal numbers. The answer should be a fraction or an integer. Note that π is already included in the answer so you just have to enter the appropriate multiple. E. g. if the answer is π/2 you should enter 1/2. If there is more than one answer enter them separated by commas.