If R1=R2, then B=0.5, the total time T of square wave in astable multivibrator

If R1=R2, then B=0.5, the total time T of square wave in
astable multivibrator using op-amp is
A T=RC B T=2 RC ln 3
C T=2 RC ln 2 D T=2RC ln (1+ 0.5)

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