pre-cal

What are the steps for solving this?

Directions Use the quadratic formula to solve the equation in the interval [0,2PI). Then use a graphing utility to approximate the angle x.

4cos^2x-4cosx-1=0

thanks.

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asked by james
  1. quadratic equation?

    cosx= (4+-sqrt(16+4))/8

    graph y=4cos^2 x - 4cosx + 1 and note where it crosses the y=0 axis.

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