Let P be the relation defined on the set of all real number such that P = [(a, b): sec^2a - tan^2b = 1]. Then P is :
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Let P represent radiation pressure, c represent speed of light and I represent radiation energy striking a unit area per second, then P^xI^yc^z will be dimensionless for 1) x=0, y=z 2)x=y=z 3)x=z=
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