Line y=x+asqrt2 is a tangent to the circ...

Line `y=x+asqrt2` is a tangent to the circle `x^2+y^2=a^2` at

A

`(a/sqrt2,a/sqrt2)`

B

`(-a/sqrt2,-a/sqrt2)`

C

`(a/sqrt2,-a/sqrt2)`

D

`(-a/sqrt2,a/sqrt2)`

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