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int(dx)/(sqrt(21+4x-x^2))=...

`int(dx)/(sqrt(21+4x-x^2))=`

A

`sin^(-1)((x-2)/(5))+c`

B

`cos^(-1)((x-2)/(5))+c`

C

`(1)/(5)sin^(-1)((x-2)/(5))+c`

D

`(1)/(5)cos^(-1)((x-2)/(5))+c`

Text Solution

Verified by Experts

The correct Answer is:
A
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