Yim Sohyun's answer to .'s Secondary 3 A Maths Singapore question.
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Hope this helps!
Date Posted:
3 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]
[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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