Q .     Tangents are drawn from the origin to the curve
`y = cos x`. Their points of contact lie on

BITSAT 2015
A

`x^2y^2 = y^2 - x^2`

B

`x^2y^2 = x^2 + y^2`

C

`x^2y^2 = x^2 - y^2`

D

none of these

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