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[" 14yfrent "],[qquad [" Fx."24" .Fif "(...

[" 14yfrent "],[qquad [" Fx."24" .Fif "(11)cos^(-1)(x)/(a)+cos^(-1)(1)/(b)=0],[" firs at frove that "(x^(2))/(a^(2))-(2xy)/(ab)(cos alpha)+(y^(2))/(b^(2))]]

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