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

pls help

Date Posted: 2 years ago
Views: 498

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Yim Sohyun
Yim Sohyun's answer
40 answers (Tutor Details)
1st
Hope this helps!
Eric Nicholas K
Eric Nicholas K
2 years ago
For part a, you skipped crucial steps for the simplification.

[The shortened formula which you used is only provided as a formula sheet in JC Maths (sin P + sin Q = 2 sin 1/2 (P + Q) cos 1/2 (P - Q))…), but it is not provided or taught explicitly in the O Levels, so the in-between steps involving the addition formula needs to be shown for Sec 3 students]
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Eric Nicholas K
Eric Nicholas K's answer
5997 answers (Tutor Details)
Rough idea, but this one is quite difficult for your level.
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Danny Low
Danny Low's answer
1017 answers (Tutor Details)
Hope this helps