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$$
I_1 = \frac{V}{R_1}
$$
$$
I_2 = \frac{V}{R_2}
$$
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I = I_1 + I_2
$$
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I = \frac{V}{R_1} + \frac{V}{R_2}
$$
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$$
I = V \left( \frac{1}{R_1} + \frac{1}{R_2} \right)
$$
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$$
I = V \left( \frac{R_2 + R_1}{R_1 R_2} \right) = V \left( \frac{R_1 + R_2}{R_1 R_2} \right)
$$
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$$
V = I \times \frac{R_1 R_2}{R_1 + R_2}
$$
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$$
I_1 = \frac{1}{R_1} \times V
$$
$$
I_1 = \frac{1}{R_1} \times \left( I \times \frac{R_1 R_2}{R_1 + R_2} \right)
$$
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$$
I_1 = \frac{R_2}{R_1 + R_2} \times I
$$
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$$
I_2 = \frac{1}{R_2} \times V
$$
$$
I_2 = \frac{1}{R_2} \times \left( I \times \frac{R_1 R_2}{R_1 + R_2} \right)
$$
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I_2 = \frac{R_1}{R_1 + R_2} \times I
$$
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