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Proving identities combines all the formulae you have met: Pythagorean, addition, double-angle. The method is to start from one side and manipulate it until it matches the other.
What you'll be able to do
Start with the more complicated side. Convert to sin and cos where helpful, combine over a common denominator, and apply known identities until it equals the other side.
Tip — Never work on both sides at once — transform one side only.
Formula recap
Common mistakes to avoid
Key takeaways
Test yourself
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Real past-paper questions on Proving Trigonometric Identities, marked mark-by-mark. How you do feeds straight into your weak-topic list, so your revision keeps targeting what actually needs work.
3 marks · 1 paper — pulled from past papers and marked mark‑by‑mark, so what you miss feeds straight into your weak‑topic list.