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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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Best answer

We know that,

On rationalizing,

Again rationalizing,

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