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જો sin^-1(x-1)+cos^-1(x-3)+tan^-1(x/(2-x...

જો `sin^-1(x-1)+cos^-1(x-3)+tan^-1(x/(2-x^2))=cos^-1 k+pi` તો

A

1

B

`-1/sqrt2`

C

`1/sqrt2`

D

એકપણ નહીં

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