Simplify or modify expressions, substitute parts of
expressions

Most mathematical expressions can be represented in different, but mathematically equivalent forms. Some of these forms might look simpler; for example, they can be visibly shorter. However, there is no universal idea as to which form of an expression is simplest. The form of a mathematical expression that is simplest for one problem turns out to be complicated or even unsuitable for another problem.

If the problem you want to solve requires a particular form
of an expression (expanded, factored, or expressed in particular terms),
choose the appropriate simplification function. If you do not need
a particular form of an expression, use `simplify`

to
shorten it.

You also can substitute for any part of an expression with a
new value by using `subs`

.

Frequently Used Topics

- Simplification

Simplify a long expression to a shorter form

- Formula Rearrangement and Rewriting

Transform expressions to a particular form or rewrite them in specific terms

- Substitution

Replace parts of expressions with the specified symbolic or numeric values

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