This article needs attention from an expert in mathematics.October 2011)(
This article needs additional citations for verification. (October 2011) (Learn how and when to remove this template message)
Solvable transcendental equations
Equations where the variable to be solved for appears only once, as an argument to the transcendental function, are easily solvable with inverse functions; similarly if the equation can be factored or transformed to such a case:
|(for an integer)|
|equivalent to (using the double-angle formula), whose solutions are those of and of , namely and and (for integers)|
Some can be solved because they are compositions of algebraic functions with transcendental functions.
|solve , giving or , then , so or|
But most equations where the variable appears both as an argument to a transcendental function and elsewhere in the equation are not solvable in closed form, or have only trivial solutions.
|No real solutions, as for all|
|is the only real solution|
Approximate numerical solutions to transcendental equations can be found using numerical, analytical approximations, or graphical methods.
Numerical methods for solving arbitrary equations are called root-finding algorithms.
In some cases, the equation can be well approximated using Taylor series near the zero. For example, for , the solutions of are approximately those of , namely and .
For a graphical solution, one method is to set each side of a single variable transcendental equation equal to a dependent variable and plot the two graphs, using their intersecting points to find solutions.