If tan α + tan β = 1 - tan α·tan β, where tan α·tan β ≠ 1, then which of the following is one of the values of (α + β) ? - NDA Mathematics 2022 (I)

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If tan α + tan β = 1 – tan α·tan β, where tan α·tan β ≠ 1, then which of the following is one of the values of (α + β) ?