Question: Determine all solutions to the equation 2 sin 2x = sin x+ -cos x on the interval [0, 2). What is the exact value

Determine all solutions to the equation 2 sin 2x = sin x+ -cos x on the interval [0, 2). What is the exact value 

Determine all solutions to the equation 2 sin 2x = sin x+ -cos x on the interval [0, 2). What is the exact value of cos 13 ? 12

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