Khi \(L_1\) nt \(L_2\) hoặc \(C_1 //C_2\):
\(T_{ss}^2=T_1^2+T_2^2\) \(\dfrac{1}{f_{ss}^2}=\dfrac{1}{f_1^2}+\dfrac{1}{f_2^2}\)
\(\lambda^2=\lambda_1^2+\lambda_2^2\) \(C_b=C_1+C_2\)
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