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Condition for Two Lines to Be Parallel

In some cases...

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In some cases we use the formula R_T=R_0(1+α(△ T)) In some other cases we use the formula R_T=R_0(1+α T) for two different temperatures of which one is unknown, and find their ratio to find the unknown temperature. In which places, these formulae should be used appropriately

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Condition for Two Lines to Be Parallel

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