how to calculate these exercises from the theory of complex variable functions

(The problems are seen in the picture)

So in the 1st problem I have to calculate the given integral as a line integral.

In the 2nd problem: I have to calculate the given integral using the Cauchy integral formula.

And in the 3rd problem: calculate the given integral with the help of residue theorem.

Unfortunately, I only understood the simple questions in my homework, however, these were a bit too challenging.

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