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lim(xrarrpi/2)(tan^(2)x((2sin^2 x+3sinx+...

`lim_(xrarrpi/2)(tan^(2)x((2sin^2 x+3sinx+4)^(1/2)-(sin^2 x+6sinx+2)^(1/2)))` is equal to

A

`1/12`

B

`-1/18`

C

`-1/12`

D

`1/6`

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