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Multiple choice

If $\displaystyle \cos \alpha $ is a root of the equation $\displaystyle 25x^{2}+5x-12=0, \ -1

  1. $\dfrac{24}{25}$
  2. $\dfrac{12}{25}$
  3. $\dfrac{2}{25}$
  4. $\dfrac{20}{25}$
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