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# Appendix A. The Last Ten Minutes

What follows is a last-minute addendum to Section 2.2.2, as this book goes to press. `Trig` is an option for the algebraic transformation functions (introduced in Section 2.2.1) except `ComplexExpand` and `PowerExpand`. With `Trig -> True`, these functions attempt to transform trigonometric functions in algebraic manipulations; with `Trig -> False`, they leave the trigonometric functions unchanged. `Trig -> False` is the default for these functions except `Simplify` and `FullSimplify` whose default is `Trig -> True`. For example, `Apart` leaves 2(cos(α) – cos(β)) csc(α) csc(β) unaltered:

```In[1]:= Apart[2 (Cos[α]- Cos[β]) Csc[α] Csc[β]]
Out[1]= 2 (Cos[α]- Cos[β]) Csc[α] Csc[β]]
```

With `Trig -> True, Apart` rewrites the trigonometric expression: ...

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