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junior college 1 | H2 Maths
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Jack
Jack

junior college 1 chevron_right H2 Maths

This is an answer scheme, kind of unsure of the first step.

How did cos(...)cos(...) become
1/2 [cos(..) + cos(..)] ?

Is there a certain formula I forgot about?

Date Posted: 7 years ago
Views: 353
Tham KY
Tham KY
7 years ago
It is in the formula sheet...

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Tan Chien Hao
Tan Chien Hao's answer
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Jack
Jack
7 years ago
Ahh that, thanks!