Question: Prove that for xy 1 provided the value of the left side of the equation is between -/2 and /2. arctan x + arctan

Prove that

arctan x + arctan y = arctan x + y 1 -

for xy ≠ 1 provided the value of the left side of the equation is
between -π/2 and π/2.

arctan x + arctan y = arctan x + y 1 - xy

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