What's the difference between evaluating the trigonometric functions at a point on the unit circle and evaluating the trigonometric functions at a point on any size circle?

Will give let f(x)=2x and g(x)=[tex]2^{x}[/tex] graph the functions on the same coordinate plane. what are the solutions to the equation f(x)=g(x) ? enter your answers in the boxes x=[? ] or x=[? ]