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2015-05-31T11:21:01+05:30

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F(θ) =  1 - θ + θ^2 / 2!  -  θ^3 / 3!  + θ^4 / 4!  .....
       = e^{-θ}

   θ has to be a dimensionless quantity as the exponent in a power ha to be a number only...

   θ has to be a dimensionless quantity as the various terms in the express on RHS have different powers of  θ..  So if θ has dimensions, then the terms on RHS cannot be added.

2 5 2
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