Prove :
` int sin x sin 2x cos 3x dx = 1/4 ((sin 2x)/2 + (sin 4x)/4 - (sin 6x)/6- x ) + c `

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Prove : int cos x cos 2 x cos 3 x dx = 1/4 ( x+ (sin 2x)/2 + (sin 4x)/4 + (sin6x)/6 ) + c

Prove : int sin x cos 2 x cos 3 x dx = - 1/4 ((cos 2x)/2 - (cos 4x)/4 + (cos 6x)/6) + c

Prove : int sin^(2) x cos 2x dx = 1/4 ( sin 2 x - (sin 4x)/4 - x) + c

Prove : int sin x sin 2x sin 3x dx = - 1/48 ( 6 cos 2x + 3 cos 4x - 2 cos 6 x) + c

Show that : int cos 2x cos 4x dx = (sin 6x)/12 + (sin 2x)/4 + c

int (sin 6x- sin 2x )/(cos 6x - cos 2x) dx

If int cos x cos 2x cos 3x dx = A_(1)sin 2x + A_(2) sin 4x + A_(3) sin 6x + C then

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

sin 3 x + 2 csin 4x + sin 6x = 4 cos ^(2) x sin 4x