The value of sin^(-1)(x^2-4x +6) +cos^(-...

The value of `sin^(-1)(x^2-4x +6) +cos^(-1)(x^2-4x+6)` for all `x in R` is a)`pi//2` b)`pi` c)0 d)None of these

A

`pi//2`

B

`pi`

C

0

D

None of these

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The correct Answer is:

D

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