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An equilateral triangle is inscribed in ...

An equilateral triangle is inscribed in the circle `x^2+y^2=a^2` with one of the vertices at (a,0). What is the equation of the side opposite to this vertex ?

A

`2x – a = 0`

B

`x + a = 0`

C

`2x + a = 0`

D

`3x – 2a = 0`

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