If "sin"^(-1) a is the acute angle betwe...

If `"sin"^(-1)` a is the acute angle between the curves `x^2+y^2=4x and x^2+y^2=8` at (2,2), then a =

A

1

B

0

C

`1/(sqrt2)`

D

`(sqrt3)/2`

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The correct Answer is:

C

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