Trig simplifying hp50g

[Thomas Ritschel]

There are quite a few commands for manipulating trigonometric functions hidden in the Catalog (CAT = right-shift SYMB), for example the TRIGSIN and TRIGTAN commands.

If you have SIN(X)/COS(X) on the stack, TRIGTAN will yield TAN(X) as expected.

However, for your example TRIGTAN (followed by EVAL) will produce TAN(X)^2 * COS(X), which is also correct, but not what you want. Setting flag 116 ("Prefer sin(x)") doesn't help.

Maybe someone else has a solution...

BTW, on the HP Prime the following works: simplify(cos2sintan(SIN(x)^2/COS(x))) = SIN(x) * TAN(x)