∫ = + = ! ∫ " = = ′ = = # " ∫ ∫ = ∫ = ∫ = ∫ + + ≠− + + =− ∫ + ∫ ∫ = +∫ $ $+ + = ∫ + =∫ = + ∫ % + & − ' = ( ( + & − '& & + & + ∫ =∫ = + + = & + = & & + − + − ∫ =∫ − = −+ + = − + =− + ∫( & + ' − & = ( − ' −& & + ! " " ) ∫ * = = − + # ∫ " # , = - ./ = − = ∫ = +% −' = - ./ % 0 ∫ − + % − ' , 1 # " " ∫ − % = − = ∫ − & & +& −' + + % − ' = −& ∫ & +& −' " ./ = = = & = # 0 = ∫ − 0 − =0 ∫0 − & =0 = = + % & = = " +& = − & 0 # & − +& & " 0 =∫ 0 − " + ∫ − & − + " + & = & − +& - ≥ ∀ ∈ 2 − ∫ − = # " =0 = = & 0 =∫ 0 < & + ∀ ∈ 0 − + + = & & = ∫ − & − − + ∫ 0 =0 − & + & − + = 0 ⇒ ++ − = 0 = 0 " − 0 = − = =− 0 − & = − ' & ⇒ 3− = =0 = % & − = − 2 ' 0' 0 0' + '