Cannot integrate cosine

[jiahao]

julia> @Integrate( cos(x), x)
:(Integrate(cos(x),x))

The other examples in README worked fine for me

[kahliburke]

It's just that Mathematica uses Cos instead of cos:

julia> @Integrate( Cos(x), x)
:(Sin(x))

[MikeInnes]

That's right, although it's possible to set up conversions between Julia and Mathematica expressions. I think the cos example actually works on master now, but I need to tag a release.