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Question
Make r2 the subject of formula `(1)/"R" = (1)/"r"_1 + (1)/"r"_2`
Solution
`(1)/"R" = (1)/"r"_1 + (1)/"r"_2`
⇒ `(1)/"r"_2 = (1)/"R" - (1)/"r"_1`
⇒ `(1)/"r"_2 = ("r"_1 - "R")/("r"_1"R")`
⇒ r2 = `("R""r"_1)/("r"_1 - "R")`.
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