I use trigreduce & trigexpand all the time to simplify trigonometric expressions.
However, I've noticed that these functions have a preference for _cosines_ instead of sines.
Thus, in order to get sines back into the picture I have to do
ratsubst(1-sin(foo)^2,cos(foo)^2,expression)
which gets pretty tedious.
Is there any way to simplify trigonometric expressions in such a way to prefer sines ?
Thanks.