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If cos^(-1)sqrt(p)+cos^(-1)sqrt(1-p)+cos...

If `cos^(-1)sqrt(p)+cos^(-1)sqrt(1-p)+cos^(-1)sqrt(1-q)=(3pi)/(4)` then the value of q is

A

`1//sqrt(2)`

B

`1`

C

`1//2`

D

`1//3`

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