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[tex]p = \int_{a= \theta}^{a=\pi/2} \cos(2a),\qquad da [/tex]

...where [itex]\theta[/itex] will normally have a value between [itex]-\pi/4[/itex] and [itex]\pi/4[/itex]. One immediate problem with the above equation is that the probability of producing a photon of a given exact angle is exactly zero. Do I need to differentiate the equation? Now what I want to do is use a random number generator to produce photons with angles that will match the distribution above when large numbers of photons are produced, but I am having difficulties achieving this. Can anyone offer any suggestions to help me out here?

P.S. If I have posted this question in the wrong forum please advise. I was wondering if it should be in the calculus forum?