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अतिपरवलय x^(2)/(cos^(2)alpha)-(y^(2))/(...

अतिपरवलय `x^(2)/(cos^(2)alpha)-(y^(2))/(sin^(2)alpha) =1 ` के लिए`alpha` के परिवत्त होने पर निम्न में कौन अचर रहता है -

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