Notion of Transcedental Expression

Expression is called transcedental if it contains variable under transcedental function, i.e. exponential, logarithmic, trigonometric or inverse trigonometric (see note functions y=arcsin(x), y=arccos(x), y=arctan(x)).

For example, `log_2(a)+log_2(b);\ sin(alpha)cos(beta)cos(gamma);\ arcsin(x^2-x)` are transcedental expression. But, for example `log_2(5)+x` is not transcedental because variable is not under logarithm.