The Step-Wise CAS handles mathematical expressions, equations and such.
Important functions to load in are asExpression and asEquation. They can be loaded in in two ways.
The preferred method is to only load in what you need.
import { asExpression, asEquation } from 'step-wise/CAS'
const exp = asExpression('sin(2x)')
const equ = asEquation('a^2+b^2=c^2')
The alternative method is to load in the entire CAS. This is useful for testing: by inspecting the CAS object, you can see what other options exist. (Or read this documentation.)
import CAS from 'step-wise/CAS'
const exp = CAS.asExpression('sin(2x)')
const equ = CAS.asEquation('a^2+b^2=c^2')
The functions asExpression and asEquation turn a string into an Expression and Equation object, respectively. These objects have a large variety of functionalities. See the Functionalities ReadMe for further information.
Are you not sure whether you already have an Expression/Equation object or just a string? In that case, load in the functions ensureExpression and/or ensureEquation. They will take an object, string or similar and will try to turn it into an Expression/Equation, or upon failure throw an error.
The CAS can turn a variety of strings/objects into functional objects. All the details of this are explained in the Interpretation ReadMe.