Equation Icon  1- − 1 1-( 𝒯 )− 1 𝒯 ( 𝒯 )−1 𝒯 2M (x ) ∂μM (x) = 2 V (x ) V(x ) ∂μV (x) V (x) + V(x) V (x) V(x ) ∂μV(x ) 1 [( ) ] = --V(x)−1 ∂μV (x)V(x )− 1 𝒯 + ∂μV (x )V(x)−1 V (x ) 2 = V (x )−1Pμ(x )V (x). (9.33 )