" (iv) "cos x+cos3x+cos5x+cos7x=0

2cos x-cos3x-cos5x=

cos3x+cos2x+cos x=0

cos4x cos8x-cos5x cos9x=0 if

Find general solutions or solution as per given condition: cosx+cos3x+cos5x+cos7x=0

Prove that (sin x + sin 3x + sin 5x + sin 7x)/(cos x + cos 3x + cos 5x + cos 7x ) = tan 4x

The period of the function f(x) = (sin x + sin 3x - sin 5x + sin 7x)/(cos x + cos 3x + cos 5x + cos 7x) is

The fundamental period of (sin x+sin3x+sin5x+sin7x)/(cos x+cos3x+cos5x+cos7x) is (pi)/(k) then k=

Lt_(x to 0) (cosx-cos4x)/(cos5x-cos7x)=

Prove the following: (frac(sinx-sin3x+sin5x-sin7x)(cosx-cos3x-cos5x+cos7x))=cot2x

Prove that (sinx+sin3x+sin5x+sin7x)/(cosx+cos3x+cos5x+cos7x)=tan4x