I'm a beaver.  
You're a beaver.
We are beavers all.
And when we get together,
we do the beaver call.
E to the u du dx.
E to the x dx.
Cosine, secant, tanget, sine.
Three point one four one five nine.
Integral, radical, mu dv.
{Java, Matlab}*, MIT.

*original {Slipstick, sliderule}