'cosxcos(60-x)cos(60+x)=1/4(cos3x)' || 'cos x cos((pi)/(3)-x)cos((pi)/(3)+x)=(1)/(4)cos3x' ||

Prove `cos x cos (60 -x) cos(60+x) = 1/4 cos 3x` Proof for cosA.cos(60-A).cos(60+A)=¼ cos3A cos x cos(60-x)cos(60+x)=1/4(cos3x) cosxcos(60-x)cos(60+x)=1/4(cos3x)' cos x cos((pi)/(3)-x)cos((pi)/(3)+x)=(1)/(4)cos3x cos x·cos(x+60)·cos(x-60) = 1/4 cos 3 Proving CosA.Cos(60°+A).Cos(60°-A)=(1/4)Cos3A #mathematics #ncert #JEE_MAINS #IITJEE #JEE_Advance #concepts_and_methods concept and method concept & method concepts and methods concepts & methods