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Problems 17-20 , solve each equation on the interval 0 2. 17 . 2sin 2 - sin - 1 = 0 18 . 2cos 2

Problems 17-20, solve each equation on the interval 0 2.

17. 2sin² - sin - 1 = 0

18. 2cos² + cos = 0

19. (tan - 1) (sec - 1) = 0

20. cos + sin = 0

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