[" 3."cos2x cos4xc],[" 6."sin x sin2x sin3x]

Show that (sin 8x cos x - sin 6x cos 3x)/(cos 2x cos x - sin 3x sin 4x) = tan 2x

(" sin 8x cos x- sin 6x cos 3x")/(" cos 2x cos x - sin 4x sin 3x")=

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?

The period of the function f(x)=( sin 8x cos x-sin 6x cos 3x )/(cos 2x cos x- sin 3x sin 4x ) is

(cos 2x sin x + cos 6x sin 3x)/(sin 2x sin x + sin 6x sin 3x) =cot 5x

Let P(x)=sqrt((cos x+cos2x+cos3x)^(2)+(sin x+sin2x+sin3x)^(2)) then P(x) is equal to

(2 cos x-3 sin x)/(6 cos x+4 sin x)

(2 cos x-3 sin x)/(6 cos x+4 sin x)

(cos 4x sin 3x -cos 2x sin x )/(sin 4x sin x+ cos 6x cos x)= tan 2x