If cos^-1 (5/13)- sin^-1 (12/13)=cos^-1 ...

If `cos^-1 (5/13)- sin^-1 (12/13)=cos^-1 x`, then x is equal to a)1 b)`1/sqrt2` c)0 d)`sqrt3/2`

A

1

B

`1/sqrt2`

C

0

D

`sqrt3/2`

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The correct Answer is:

A

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