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The equation of the tangent to the circl...

The equation of the tangent to the circle `x^2+y^2=a^2,` which makes a triangle of area `a^2` with the coordinate axes, is `x+-y=asqrt(2)` (b) `x+-y=+-asqrt(2)` `x+-y=2a` (d) `x+y=+-2a`

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