Solve: 10 sin^2 (X) - 3sin (X) - 1 = 0

Let u = sin (x).

The given equation is equivalent to

(2u - 1) (5u + 1) = 0

(10u + 1) (u - 1) = 0

(5u - 1) (2u - 1) = 0

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Twice the difference of a number and seven

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