i want to know the cut off frequency on the 2 OPAMPS ... Do I take 6K resistor and 5K resistor for OPAMP#2
If you wanted to factor-in that R1 and R3 adds resistance to R2 you'd calculate the parallel combination of R1 and R3 as 2.73 kohms. Then you would add it to R2 and get a total resistance of 3.73 kohms. This produces a cut-off (in conjunction with C1) of about 91 kHz.

This assumes that the input signal (V2) is a voltage source with low output impedance.