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secondary 4 | A Maths
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secondary 4 chevron_right A Maths chevron_right Singapore

Help me with 9e please, I have been spending 30 mins on it. Thanks in advance.

Date Posted: 5 months ago
Views: 32
Mathaddict100
Mathaddict100
5 months ago
Managed to prove the answer.Will show it to you shortly.

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Mathaddict100
Mathaddict100's answer
348 answers (A Helpful Person)
1st
Hope these steps help. :)
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Eric Nicholas K
Eric Nicholas K's answer
2980 answers (Tutor Details)
Eric Nicholas K
Eric Nicholas K
5 months ago
Double angle formulae apply here. Note that angle 4A is double that of anngle 2A, so double angle applies to 4A and 2A also.