Additional Mathematics in Singapore secondary schools moves fast. With exams moving from the O-Level to the new SEC from 2027, the core skills stay the same.
Trigonometric identities
Keep a single sheet of identities and prove each one yourself at least once. You’ll recognise them faster under pressure.
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When stuck on a proof, rewrite everything in sin and cos. It works more often than not. (Daniel)
Calculus applications
Rates of change and stationary points appear every year. Practise reading the question carefully to see what is being asked.