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This can be solved without recourse to any trigonometry, simply by using similar triangles.
Question should be independent and new most of problem and solution are just copied from mind your decision
![Proof : E[X] = Var[X] in Poisson Distribution](http://i.ytimg.com/vi/IJZcnkQOI4g/mqdefault.jpg)
This can be solved without recourse to any trigonometry, simply by using similar triangles.
Question should be independent and new most of problem and solution are just copied from mind your decision