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A = \cos^{- 1} [3 / 5]

হলে B এর মান কত?

\cos^{- 1} [5 / 3]

\tan^{- 1} [4 / 3]

s e c^{- 1} [5 / 3]

\tan^{- 1} [3 / 4]

ANS : 4

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