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If a2sec2x - b2tan2x = c2 then the value of sec2x + tan2x is equal to (assume b2 ≠ a2 )

b2-a2+2c2b2+a2
b2+a2-2c2b2-a2
b2-a2-2c2b2+a2
b2-a2b2+a2+2c2

Correct Answer: b2+a2-2c2b2-a2

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