How do you prove (x+y)^2 >= 4xy?

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... Find the equation of the line tangent to the ellipse b^2*x^2 + a^2*y^2 = a^2*b^2 in ... Can you provide a proof of the first ... how do you find ... - Read more

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How do you prove (x+y)^2 >= 4xy? resources

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