Calculate Cut-Off Frequency for Low Pass Filter w/ 2 Op-Amps

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To calculate the cut-off frequency of a low pass filter with two op-amps, the standard formula fc = 1/(2∏(fn)RC) applies, but adjustments are needed for multiple stages. Each op-amp's individual frequency response must be considered, as they may have different values for fn, R, and C. The cut-off frequencies for each stage should be calculated separately and then combined to determine the overall filter response. The interaction between the two stages can affect the final cut-off frequency, so it's important to analyze the circuit diagram for accurate results. Properly calculating the cut-off frequency ensures optimal filter performance in the intended application.
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How do I work out the cut-off (corner) frequency of a Low Pass Filter?

I know the equation is fc = 1/(2∏(fn)RC)

but I have 2 op-amps in the filter both with different fn's, R's and C's

is it simply calculate each part separately and add the 2 values together?

Cheers
 
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