Trigonometry Examples

$13^{2} = x^{2} + y^{2} - 2 x y \cos (60)$ , $17^{2} = x^{2} + y^{2}$

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$13^{2} = x^{2} + y^{2} - 2 x y \cos (60), 17^{2} = x^{2} + y^{2}$