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The value of the expression tan[(1/2)cos^-1(2/√5)] is

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The value of the expression tan[(1/2)cos-1(2/√5)] is

(A) 2√5 

(B) √5 – 2

(C) (√5 - 2)/2

(D) 5 - √2

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1 Answer

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Answer is (B)

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