Calculus › Section A · Preparing for calculus › Topic A.4
Trigonometric functions review
Anything that repeats — seasons, sound waves, tides — is modelled by trigonometry. Calculus has its own conventions for it, and this review aligns your toolkit with them.
In this topic
- Why radians, and why now
- Radian measure
- Converting between degrees and radians
- The unit circle definition
- Worked example: exact values from two triangles
- The other four functions
- Signs by quadrant
- Identities worth keeping
- Graphs: amplitude and period
- Worked example: solving a trigonometric equation
- Common mistakes to avoid
- Key takeaways
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Standards: Prerequisite