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If cos^(-1)x=tan^(-1)x, then...

If `cos^(-1)x=tan^(-1)x`, then

A

`x^(2)=(sqrt(5)-1)/2`

B

`x^(2)=(sqrt(5)+1)/2`

C

`sin(cos^(-1)x)=(sqrt(5)-1)/2`

D

`tan(cos^(-1)x)=(sqrt(5)-1)/2`

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The correct Answer is:
A
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