HSC trigonometry Extension 1 goes well beyond SOHCAHTOA. Students must master compound angle formulas, double angle identities, trig equations over specified domains, and inverse trigonometric functions — often in multi-step exam questions.
Key trig topics for Extension 1
- Compound angle identities: sin(A ± B), cos(A ± B), tan(A ± B)
- Double angle formulas and t-formulae
- Solving trig equations — general solutions and restricted domains
- Inverse trig functions — domain, range, and compositions
- Trig graphs and transformations
Free trigonometry booklet
HSC Trigonometry on Vu's Maths Hub covers identities, equations, graphs, and inverse trig with worked examples for Extension 1 and Extension 2.
Trig connects everywhere
Trigonometry links to HSC Complex Numbers (Euler's formula), HSC Integrals (trig integration), and HSC Mechanics (projectile motion angles).
For mixed practice: HSC Collections. For past paper style revision across all topics, visit vumaths.com.
Extension 1 worked solutions, NESA-aligned HSC Maths revision notes — free for NSW students.
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