# Revision history [back]

### Working with series

I can't get how to work with series. I do

sage: R.<t> = PowerSeriesRing(QQ)
sage: t^2
t^2
sage: sin(t)


but the last rises an error. I want to do usual manipulations like sin(t)/cos(t+2)^2.

### Working with series

I can't get how to work with series. I do

sage: R.<t> = PowerSeriesRing(QQ)
sage: t^2
t^2
sage: sin(t)


but the last rises an error. I want to do usual manipulations like sin(t)/cos(t+2)^2.sin(t)/cos(t+2)^2.