If the value of

\(\left( 1\quad +\quad cos\frac { \pi }{ 8 } \right) \left( 1\quad +\quad cos\frac { 3\pi }{ 8 } \right) \left( 1\quad +\quad cos\frac { 5\pi }{ 8 } \right) \left( 1\quad +\quad cos\frac { 7\pi }{ 8 } \right)\)

can be written as \(\frac { x }{ y }\), then find out the value of x + y.

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