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If f(x)=cos^(- 1)x+cos^(- 1){x/2+1/2sqrt...

If `f(x)=cos^(- 1)x+cos^(- 1){x/2+1/2sqrt(3-3x^2)}`then

A

`f(2/3)=(pi)/3`

B

`f(2/3)=(pi)/2`

C

`f(1/3)=(pi)/3`

D

`f(1/3)=2"cos"^(-1)1/3-(pi)/3`

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