1.

\left. \begin{array} { l } { ( a ) x = - \frac { \pi } { 20 } + \frac { \pi } { 5 } n \quad ( b ) x = \frac { \pi } { 40 } + \frac { \pi } { 10 } n } \\ { ( c ) x = \frac { 3 \pi } { 20 } + \frac { \pi } { 5 } n } \end{array} \right.

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