Points of discontinuity.
y = cot x, [0, 2 \[\pi \] ]

cotx = (cosx)/(sinx)
 Where is this function not defined?
i.e. where is sin(x)=0?
Because at this point, cotx will be undefined because you cannot divide by zero. So find all points from 0 to 2 pi where sinx is 0.

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Maybe the answer is 20mm. all i really did was just multiply, which is obvious.