De fato, ( left parenthesis F left parenthesis g left parenthesis x right parenthesis right parenthesis right parenthesis apostrophe equals F apostrophe left parenthesis g left parenthesis x right parenthesis right parenthesis g apostrophe left parenthesis x right parenthesis equals f left parenthesis g left parenthesis x right parenthesis right parenthesis g apostrophe left parenthesis x right parenthesis. Desse modo