Trigonometry identities - XI Grade : Prove that 4 ( Cos^3 10 + Sin^3 20) = 3( Cos 10 + Sin 20)

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Trigonometry identities - XI Grade : Prove that 4 ( Cos^3 10 + Sin^3 20) =
3( Cos 10 + Sin 20)
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Thank you so much sir. I searched for this in google and it didn't show the formula. This helped me a lot

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