IB DP Maths: AA HL复习笔记3.8.1 Trigonometric Proof
Trigonometric Proof
How do I prove new trigonometric identities?
- You can use trigonometric identities you already know to prove new identities
- Make sure you know how to find all of the trig identities in the formula booklet
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To prove an identity start on one side and proceed step by step until you get to the other side
- It is more common to start on the left hand side but you can start a proof from either end
- Occasionally it is easier to show that one side subtracted from the other is zero
- You should not work on both sides simultaneously
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What should I look out for when proving new trigonometric identities?
- Look for anything that could be a part of one of the above identities on either side
You will most likely need to be able to work with fractions and fractions-within-fractions- Always keep an eye on the 'target' expression – this can help suggest what identities to use
Exam Tip
Worked Example
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