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How to derive cos(2x) in all three forms?

YouTubeSB MathsYT

How to derive cos(2x) in all three forms?

Follow on from yesterday's similar video about sin(2x). We can write cos(2x) in three different forms and in this video we use the addition angle formula for cosx and the well known Pythagorean identity to derive all three of these forms. Subscribe for more #shorts and daily uploads of longer videos on A level Maths, Further Maths and ...

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