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f	=	(1/2C(R₁+R₂))x(R₃/R₄)
	=	(1/(2x0.1x10^-6x(5.6x10³+100x10³))x(120x10³/100x10³)
	=	(1/(21.12x10^-3))x1.2
	=	56.8 Hz

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