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## Homework Statement

I am trying to grasp this stuff, but it is getting late and my mind is noodeling. Can I have some help on this?

show that d(λmu) = m(1-(u^2/c^2)^(-3/2) du

thanks!

## Homework Equations

λ = 1/√(1-(u^2/c^2))

## The Attempt at a Solution

I have attacked this through integration and differentiation, but am still missing something