What you need to know
Check yourself against these “I can” statements.
- I can explain and use tan θ = sin θ/cos θ (Further Maths)
- I can explain and use sin²θ + cos²θ = 1 (Further Maths)
Practise this topic
3 resourcesTrig Identity Proofs
Prove identities using sin²θ + cos²θ ≡ 1 and tan θ ≡ sin θ / cos θ: one-, two-, three- and four-step proofs, each step with its reason, then decide whether a statement is always, sometimes or never true and explain why. Five…
🧩 ConnectionsSimplifying Trig (sin, cos, tan)
Sixteen expressions in sin x, cos x and tan x: find the four that simplify to the same thing, using tan x = sin x ÷ cos x and sin²x + cos²x = 1.
⬢ BlockbustersTrig Identity Proofs Blockbusters
Blockbusters with the questions from the Trig Identity Proofs worksheet: choose its levels for the ordinary hexagons and for the harder ★ ones. Show the answer and the worked solution, or play against the computer with multiple…
These are the pages for Trigonometric identities in the GCSE + AQA Level 2 Further Maths scheme of work, following Pearson Edexcel GCSE (9–1) Higher (1MA1), plus AQA Level 2 Further Mathematics (8365). Open this topic in Mr Wells Maths to see it alongside the rest of the course.