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Can someone explain with steps. Thank you Section 7.5 Solve the equations in the interval [0, 27). Give the exact value(s). 15. 5 cos 20

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Can someone explain with steps. Thank you

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Section 7.5 Solve the equations in the interval [0, 27). Give the exact value(s). 15. 5 cos 20 = 2 16. 2cos2 x + cos 2x = 0 17. 4 sin 0 cos 0 + 2 sin 0 - 2 cos 0 - 1 = 0

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