(sin theta)/(cos(3theta))+(sin(3theta))/...

`(sin theta)/(cos(3theta))+(sin(3theta))/(cos(9theta))+(sin(9theta))/(cos(27theta))+(sin(27theta))/(cos(81theta))=`

`(sin(81theta))/(2cos(80theta)cos theta)`

`(sin(80theta))/(2cos(81theta)cos theta)`

`(sin(81theta))/(cos(80theta)cos theta)`

`(sin(80theta))/(2cos(81theta)cos theta)`

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