Question 70182
The exponent of {{{1/2}}} means take the square root of this quantity. In another form your equation is:
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{{{x = - 1/(2*phi*sqrt(FC))}}}
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Are you sure this equation is correct?  {{{phi}}} usually represents magnetic flux  or possibly
the phase shift in an a-c voltage.  Did you mean {{{pi}}} ... the radian measure of a 
circle equivalent to 180 degrees?
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Also, this is not the equation for the capacitive resistance in an a-c circuit.  That equation
is:
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{{{Xc = 1/(2*pi*f*C)}}}
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It is also not the equation for the resonant frequency of a series R-L-C circuit.
That equation is:
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{{{Fo = 1/(2*pi*sqrt(LC))}}}
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I'm a little rusty as you can tell, but I don't recall the equation you provided.