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I am trying to understand how to solve the equation

$2\sin^2x + 3\sin x + 1 = 0.$

Please give hints.

  • 0
    @EricNaslund *Ach so*. I did misunderstand, sorry about that.2012-12-21

2 Answers 2

7

Hint: Let $y=\sin x$. Solve for $y$ first, then solve for $x$.

4

Just treat $\sin x$ as a variable, and solve the polynomial.