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secondary 4 | A Maths
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Yuheng Lee
Yuheng Lee

secondary 4 chevron_right A Maths

Help Pls! Tq!

Date Posted: 2 years ago
Views: 194
Sean Ng Jake Peng
Sean Ng Jake Peng
2 years ago
a) use trig addition formula sin(2x+x)
b) sub in from part i
This should help..

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Ang Yew Keong
Ang Yew Keong's answer
59 answers (Tutor Details)
The double angle formula is a very versatile identity and can be changed easily to fit different variables. Try to solve 9b on ur own once u understood the steps to prove the identities. :)
Ang Yew Keong
Ang Yew Keong
2 years ago
Try to solve 9aii on ur own i mean**