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I am stuck in my research with a probability density function problem..

I have 'Alpha' which is a random variable from 0-180. Alpha has a uniform pdf equal to 1/180.

Now, 'Phi' is a function of 'Alpha' and the relation is given by,

Phi = (-0.000001274370471*Alpha^4) + (0.000393888213304*Alpha^3) - (0.037767210716686*Alpha^2) + (1.66089231837634*Alpha) - 5.83257204679921

I am trying to find the PDF or CDF of 'Phi' but having a hard time in doing that..

Any help will be greatly appreciated!

Thanks.