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Question

If x>13 then 3 tan1x=

A
tan13xx313x2
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B
π+tan13xx313x2
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C
π+tan13xx313x2
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D
πtan13xx313x2
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Solution

The correct option is C π+tan13xx313x2

When x>13,π6<tan1x<π2π2<3tan1x<3π2
3tan1xQ2 or Q3
In the formula, 3tan1x=tan13xx313x2
3xx313x2<0 as 3x2<1,3x>x3tan13xx313x2Q4
3tan1x=π+tan13xx313x2

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