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Rewrite expression in terms of another function

`rewrite(expr,target)`

`rewrite`

replaces symbolic function calls in`expr`

with the target function only if the replacement is mathematically valid. Otherwise, it keeps the original function calls.

`collect`

| `combine`

| `expand`

| `factor`

| `horner`

| `numden`

| `simplify`

| `simplifyFraction`

| `unitConvert`