Graphics Calculator for Solving Trig Functions w/ Variables

[Ry122]

Does anyone know of a graphics calculator that can solve simultaneous equations that have trigonometric functions with variables ie. cos(x)?

 

[Mk]

I think most graphing calculators can do this easily. My TI-89 and TI-92 can.

 

[Ry122]

on my casio the simultaneous equation solver just let's you sub a, b, and c values into
anX+bnY=Cn and if you just try subbing a function such as cos into one of them it says Syn error. Does it work in a similar way on your calculator or are you able to just type in the whole equation?

 

[Mk]

When solving simultaneous equations I normally use an approach utilizing a calculator's ability to handle matrices, and the reduced row echelon form function, rref(. Can yours do that?