\(x=asin\theta\) এবং \(y=btan\theta\) থেকে \(\theta \)অপনয়ন করো।
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\(x=a\sin \theta\)
বা, \(\cfrac{x}{a}=\sin\theta\)
বা, \(cosec \theta=\cfrac{a}{x}\)

আবার, \(y=b\tan \theta\)
বা, \(\cfrac{y}{b}=\tan\theta\)
বা, \(cot \theta=\cfrac{b}{y}\)

আমরা জানি, \(cosec^2\theta-cot^2\theta=1\)
বা, \(\cfrac{a^2}{x^2} - \cfrac{b^2}{y^2} =1\) [Answer]

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