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幾何學上，橢圓係圓錐打斜切開嘅橫切面曲線，睇落似壓扁嘅圓。
( x a ) 2 + ( y b ) 2 = 1 {\displaystyle \left({\frac {x}{a}}\right)^{2}+\left({\frac {y}{b}}\right)^{2}=1}
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