`int cos 2x.cos 4x. Cos 6x dx` is equal to

int cos x cos 2x cos 3x dx=

int cos 4x. cos 2x dx

int cos 4x. cos 2x dx

The value of int(sinx.cosx.cos2x.cos4x.cos8x.cos16x) dx is equal to

The value of int(sinx.cosx.cos2x.cos4x.cos8x.cos16x) dx is equal to

int e^(cot x)(cos x-cos ecx)dx is equal to :

The value of int_( sin )x cos x cos2x cos4x cos8x cos16x)dx is int(sin x cos x cos2x cos4x cos8x cos16x)dx is equal to

int cos2x*cos4x*cos6x dx

int cos 4x cos x dx = ?