Prove that 1 + cos 2x + cos 4x + cos 6x = 4 cos x cos 2x cos 3x

1+ cos 2x + cos 4 x+ cos 6x- 4 cos x cos 2x cos 3x =

1+ cos 2x+ cos4x + cos 6x=

int cos 2x . cos 4x . cos 6x dx

int cos 2x . cos 4x . cos 6x dx

Prove that 1+cos2x+cos4x+cos6x =4cosx cos 2x cos 3x

Prove that: 1+cos2x+cos4x+cos6x=4cos x cos2x cos3x

cos 10x + cos 8x + 3 cos 4x + 3 cos 2x=

cos 10x + cos 8x + 3 cos 4x + 3 cos 2x=

1+ cos 2x+ cos4x + cos 6x= ............. A) 2 cos x cos 2x cos 3x B) 4 sin x cos 2x cos 3x C) 4 cos x cos 2x cos 3x D) 2 sin x cos 2x cos 3x