# Using Reduction Formulae

> This section reduces an obtuse, reflex, negative or out-of-range angle to an acute reference angle so that sin, cos and tan can be written as ± a special-angle ratio without a calculator. Two routes…

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## More in Trigonometry

- [Special Angles](https://www.hlayiso.com/grade-12/mathematics/notes/trigonometry/special-angles) — Previous section
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## Frequently asked questions

### What will I learn in "Using Reduction Formulae"?

This section covers Using Reduction Formulae as part of Trigonometry in Grade 12 Mathematics. You'll find clear explanations, worked examples, and key definitions aligned to the CAPS curriculum.

### Is this section aligned with the CAPS curriculum?

Yes. All notes on Hlayiso, including "Using Reduction Formulae", are written against the official CAPS curriculum and ATP for Grade 12 Mathematics.

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Continue with the next section in Trigonometry, or test your understanding with the interactive quiz linked to this section.

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