/ ____ ____ \ / ____ ____ \ / ____ ____ \ / ____ ____ \ / ____ ____ \ / ____ ____ \ / ____\ / ____ ____\ / ____ ____\ | 3 ___ 9 / 3 /pi\ 3 ___ 9 / 3 /pi\| | 3 ___ 9 / 3 /pi\ 3 ___ 9 / 3 /pi\| | 3 ___ 9 / 3 /2*pi\ 3 ___ 9 / 3 /2*pi\| | 3 ___ 9 / 3 /2*pi\ 3 ___ 9 / 3 /2*pi\| | 3 ___ 9 / 3 /4*pi\ 3 ___ 9 / 3 /4*pi\| | 3 ___ 9 / 3 /4*pi\ 3 ___ 9 / 3 /4*pi\| | 3 ___ 9 / 3 | | 3 ___ 9 / 3 3 ___ ___ 9 / 3 | | 3 ___ 9 / 3 3 ___ ___ 9 / 3 | | \/ 2 *\/ y *cos|--| I*\/ 2 *\/ y *sin|--|| | \/ 2 *\/ y *cos|--| I*\/ 2 *\/ y *sin|--|| | \/ 2 *\/ y *cos|----| I*\/ 2 *\/ y *sin|----|| | \/ 2 *\/ y *cos|----| I*\/ 2 *\/ y *sin|----|| | \/ 2 *\/ y *cos|----| I*\/ 2 *\/ y *sin|----|| | \/ 2 *\/ y *cos|----| I*\/ 2 *\/ y *sin|----|| | \/ 2 *\/ y | | \/ 2 *\/ y I*\/ 2 *\/ 3 *\/ y | | \/ 2 *\/ y I*\/ 2 *\/ 3 *\/ y | | \9 / \9 /| | \9 / \9 /| | \ 9 / \ 9 /| | \ 9 / \ 9 /| | \ 9 / \ 9 /| | \ 9 / \ 9 /| |x - -------------|*|x + ------------- + ---------------------|*|x + ------------- - ---------------------|*|x + --------------------- + -----------------------|*|x + --------------------- - -----------------------|*|x + - ----------------------- + -------------------------|*|x + - ----------------------- - -------------------------|*|x + - ----------------------- + -------------------------|*|x + - ----------------------- - -------------------------| \ 2 / \ 4 4 / \ 4 4 / \ 2 2 / \ 2 2 / \ 2 2 / \ 2 2 / \ 2 2 / \ 2 2 /