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

अतिपरवलय `(x^2)/(cos^2alpha)-(y^2)/(sin^2alpha)=1` के लिए `alpha` का मान परिवर्तित करने पर निम्न में से क्या अचर रहेगा ?

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