Derivation of cos2x | Class 11

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The video describes how we get to write cos2x in various other forms through the use of previous identities that we know. Don'y just remember the formula but rather know the logic behind them.
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Nice video mate. Keep up the good work. 👏

skadyanaug
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arey bhai itna lamba kyun kar rahe ho?

gameral_paseeno