The value of $$\oint\limits_c {{1 \over {{z^2}}}dz} $$ where the contour is the unit circle traversed clock - wise, is

Let $$j\, = \,\sqrt { - 1} $$. Then one value of $${j^j}$$ is

For the function $${{\sin z} \over {{z^3}}}$$ of a complex variable z, the point z = 0 is

Let $${z^3}\, = \,\overline z $$, where z is a complex number not equal to zero. Then z is a solution of