Solve the problem.
-$$\text { If } f ( \theta ) = \sin \theta \text { and } f ( a ) = - \frac { 1 } { 9 } \text {, find the exact value of } f ( a ) + f ( a - 4 \pi ) + f ( a - 2 \pi )$$

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The Answer of Solve the problem.
-$$\text { If } f ( \theta ) = \sin \theta \text { and } f ( a ) = - \frac { 1 } { 9 } \text {, find the exact value of } f ( a ) + f ( a - 4 \pi ) + f ( a - 2 \pi )$$

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