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Question
junior college 1 | H2 Maths
One Answer Below
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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: 6 years ago
Views: 318
It is in the formula sheet...
See 1 Answer
done
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clear
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identity
Date Posted:
6 years ago
Ahh that, thanks!
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