tan α = \(m\over m-1\) এবং tan β = \(1\over 2m - 1\) হলে, (α - β)-এর মান নির্ণয় করুন।

1
\(π\over4\)
2
\(π\over2\)
3
\(π\over6\)
4
\(π\over3\)

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