Since their values are both $4 \, mH$, the equivalent inductance of these two in parallel is given by the formula for parallel inductors:
\[L_{\text{eq}} = \frac{L_1 \cdot L_2}{L_1 + L_2} = \frac{4 \, mH \cdot 4 \, mH}{4 \, mH + 4 \, mH} = 2 \, mH\]
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