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Let x and y be 2 real numbers which sati...

Let x and y be 2 real numbers which satisfy the equations `(tan^(2)x - sec^(2)y )= (5a)/(6) - 3 ` and ` (- sec^(2)x + tan^(2)y ) = a^(2) ` , then the product of all possible value's of a can be equal to :

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