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One of the most famous equations in physics, E=mc², is actually an abbreviation for a longer equation in special relativity theory. The full equation is E²=(mc²)²+(pc)², where E is the total energy of a particle, m is its rest mass, c is the speed of light, p is the momentum of the particle, and the equation relates energy, mass, and momentum. However, the simplified version, E=mc², is more widely known and represents the equivalence of mass and energy, a revolutionary concept introduced by Albert Einstein in 1905.
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