The random variable X represents the amplitude of a sine wave; Y represents the amplitude of a cosine wave. Both are independently and uniformly distributed over the interval 0 to 1.
(i) Let the random variable R represent the amplitude of their resultant; that is, R2 = X2 + y2. Find and sketch the probability density function of R.
(ii) Let the random variable 0 represent the phase angle of the resultant; that is, θ = tan-1 (Y/X). Find and sketch the probability density function of θ.