anonymous
  • anonymous
Solve: 2sin^2x - sinx = 10 0
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
Let u=sinx. Substitute then solve it like a normal quadratic equation. Then substitute the sinx back to solve for answers in terms of x.
anonymous
  • anonymous
but then what do I do with the 2 at the beginning? divide it?
anonymous
  • anonymous
You have this: 2(sinx)^2-sinx=10. If you say u=sinx, then 2u^2-u=10 This is a normal quadratic equation.

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