Question: help with random numbers in sequence

I am trying to construct a random set of angles measured in degrees with pairs that are the equivalent in radians.  for example [0,0],[90,Pi/2],[-30,-Pi/6],etc...  but completely random.

so far I have the following:

restart;
randomize();
a := rand(-90 .. 90);
seq([a(i), convert(a(i)*degrees, radians)], i = 1 .. 4);

the trouble is it appars it is randomizing a both times it is called in the sequence.  I would like to have it randomize for each iteration in the sequence.

thanks in advance.

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