\
Let
f
and
g
be one-to-one functions.
\
So,
\
Therefore the statement is true.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=af2939e4c783618da26a2fe961e3e4be.png\")
![\"\"](\"/userfiles/image/steps_images/solution.JPG\")