Q.2452 : यदि (a cot θ + b cosec θ) = x तथा ( b cot θ + a cosec θ) = y हो तो x²

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Q.2452 : यदि (a cot θ + b cosec θ) = x तथा ( b cot θ + a cosec θ) = y हो तो x² - y² = ?
(a) a² + b²
(b) a² - b²
(c) b² - a²
(d) (a-b)²

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Answer :b² - a²