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$Insertformulahere$

$Insertformulahere$ Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle O}

$sqrt{x}$

${\color {Blue}x^{2}}+{\color {YellowOrange}2x}-{\color {OliveGreen}1}$