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HELM Book 1.5.2 Task 2. This is a fixed question, asking you to rearrange an equation.

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Make \\(R\\) the subject of the formula \\(\\frac1R=\\frac{1}{R_1}+\\frac{1}{R_2}\\).

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1. Add the two terms on the right to make a single fraction: (to write \\(R_1\\) type R_1, to write \\(R_1\\times R_2\\) write R_1*R_2. )

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\\(\\frac{1}{R_1}+\\frac{1}{R_2}=\\)[[0]]

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2. Write down the complete formula:

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[[1]]

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3. Now invert both sides:

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[[2]]

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