Q.2451 : यदि x = a sec θ तथा y = b tanθ हो तो (x²/a²

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Q.2451 : यदि x = a sec θ तथा y = b tanθ हो तो (x²/a² - y² / b² ) का मान होगा?
(a) 1
(b) - 1
(c) 2
(d) -2

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Answer :1