u(v(x)) = u ( 2 x 2 ) = cos ( 2 * 2 x 2 ) = cos ( 4 x 2 )
v(u(x)) = v ( cos ( 2 x ) ) = 2 * cos 2 ( 2 x ) )
v(w(x)) = v ( (x-1)1/2 ) = 2 * ( x - 1 ) 1/2 ) 2 = 2 ( x - 1 )
w(v(x)) = w ( 2 x 2 ) = ( 2 x 2 - 1 ) 1/2
u(w(x))= u ( ( x - 1 ) 1/2 ) = cos ( 2 * ( ( x - 1 )1/2 ) )
w(u(x))= w ( cos ( 2 x ) ) = ( cos ( 2 x ) - 1 ) 1/2