If sec θ + tan θ = m and sec θ - tan θ = n, prove that mn = 1.
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mn = (sec θ + tan θ)(sec θ - tan θ)
mn = (sec2 θ - tan2 θ)
By, trigonometric identities sec2 θ - tan2 θ = 1.
∴ mn = 1.
Hence, proved that mn = 1.
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