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Q.

If cos⁡2tan−1⁡x=12, then the value of x, is

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a

3

b

13

c

1-3

d

1-13

answer is B.

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Detailed Solution

cos⁡2tan−1⁡x=12⇒ 2tan−1⁡x=π3⇒tan−1⁡x=π6⇒x=tan⁡π6=13
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If cos⁡2tan−1⁡x=12, then the value of x, is