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In the rest frame of a particle of mass M, decaying into 2 particles with masses m1 and m2, show that

E₁/c²= M²=m₂²+m₁²/ 2M

and

|p₁|/c = (AB)^1/2/ M, where A = M² - (m₁+ m₂)²; B = M²-(m₁ - m₂)²

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