" l."cos x*cos2x*cos3x

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

Differentiate the functions given w.r.t.x: cos x*cos2x*cos3x

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 =

If cos ecx=(2)/(sqrt(3)) and cot x=-(1)/(sqrt(3)) for xin[0,2 pi] then cos x+cos2x+cos3x+...+cos100x is

int cos x cos 2x cos 3x dx=

If cos ecx=(2)/(sqrt(3)) and cot x=(-1)/(sqrt(3))x in[0,2 pi], then the value of cos x+cos2x+cos3x is equal to

Evaluate: int cos x cos2x cos3xdx

Let quad cos x+cos2x+cos3x+cos4x+cos5x+cos6x+cos7xy=(cos x+cos2x+cos3x+cos4x+cos5x+cos6x+cos7x)/(sin x+sin2x+sin3x+sin4x+sin5x+sin6x+sin7x), then which of the following holds good?