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secondary 3 | A Maths
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secondary 3 chevron_right A Maths chevron_right Singapore

Need help with the proving. Thank You

Date Posted: 2 months ago
Views: 47

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Eric Nicholas K
Eric Nicholas K's answer
5807 answers (Tutor Details)
This is a rough idea on how to work this problem. If you forget the double angle formula, you can still split cos 2x into cos (x + x) in a similar way.

These are the dedicated formulae for sin 3x and cos 3x, but you do not have to memorise this at your level. JC students use the result for sin 3x and cos 3x more frequently than secondary students do.
2 months ago
Thank You
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Hiderapplecross's answer
1128 answers (Tutor Details)
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