To use a function, type the letters that represent the function, and then surround the expression in that function with parentheses. For example, to represent the square root of `4*a+b`

4*a+b, type `sqrt(4*a+b)`

.

You can use the following functions:

- Common functions:
- sqrt
- log10
- log2
- ln
- exp
- abs

- Trigonometric functions and their inverses, as well as hyperbolic trigonometric functions and their inverses:

**Function****Inverse****Hyperbolic Function****Inverse**sin arcsin sinh arcsinh cos arccos cosh arccosh tan arctan tanh arctanh sec arcsec sech arcsech csc arccsc csch arccsch cot arccot coth arccoth -
Factorials: Enter factorials as

`fact(3)`

or`factorial(3)`

. You must use integers. For example, you cannot enter`fact(1.5)`

. - A “parallel resistors” operator (
`||`

). For example,`1 || 2`

represents the resistance of a pair of parallel resistors (of resistance 1 and 2 ohms), evaluating to 2/3 (ohms).