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int (dx)/(sqrt(1-tan ^(2) x))=(1)/(lamda...

`int (dx)/(sqrt(1-tan ^(2) x))=(1)/(lamda)sin ^(-1) (lamda sin x)+C, then lamda=`

A

`sqrt2`

B

`sqrt3`

C

2

D

`sqrt5`

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The correct Answer is:
A
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