Proof of cos3x = 4cos³x - 3cosx

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I could understand thanks sir pls make videos of complete trignonometry chapter class 11❤

kingharshith
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Very easy and understanding explanation ❤Thank you so much Sir🤩🤩

adhilkrishnan
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Tq.. sir.. we could understand ur explanation.

bency
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So useful sir🫶🏻😭😭😭 u safe me from struggle because i cannot prove it 😭

woxiangnian