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are given in terms of the polar angle # by sin# + cos#. Without finding u find

a. its value at the centre of the disc

b. its maximum and minimum values on the closed disc.

The disc is probably defined as D(x,y),r) where r=x^2+y^2 ≤ 1 and I think that the max and minimum can be find on the boundary of the set.But I think that u must also be continuous for that to happen.

Can someone give me a detailed explanation or an example on how to solve this problem?