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arctan(x) - arctan(y) = (for xy > -1):

Aarctan((x-y)/(1+xy))
Barctan(x-y)
Cx - y
Dln(x/y)
Answer & Solution
Correct answer: A. arctan((x-y)/(1+xy))
Subtraction formula: arctan(x) - arctan(y) = arctan((x-y)/(1+xy)) when xy > -1. For xy ≤ -1, add or subtract π.
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