Eric Nicholas K's answer to Julius's Secondary 3 A Maths Singapore question.
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The first thing we start off with is the conversion from 2x to x, since you would probably have noticed the differences between the angles.
We have to choose a good form of cos 2x to use so that we can simplify the expression.
We have to choose a good form of cos 2x to use so that we can simplify the expression.
Date Posted:
3 years ago
It depends on which you choose. The 1 could be converted as well
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