#269 trigreduce(sin(x)^2/cos(x)^2)

[Stavros Macrakis]

trigreduce(sin(x)^2/cos(x)^2) => tan(x)^2

Shouldn't it return (1-cos(2*x))/(1+cos(2*x))?

For that matter, it would be nice if trigreduce(tan(x)^2)
also did this, but the documentation of trigreduce
explicitly says that it handles only sin's and cos's
(unlike trigexpand, which handles trigs in general).

On the other hand, Trigrat already does this.