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Use the Quadratic Formula to solve the equation in the interval [0,2pi). Then use a graphing utility to approximate the angle x.

(1) 5/(tanx+secx)

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

Thank you.

  • More trig -

    1) is not an equation

    cosx= (4+-sqrt(16-4*(4)(-1))/8= you do it
    check my thinking.

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