This task is aimed at helping learners understand the connections between transformations when applied to different types of functions studied at Higher.  Each row should be considered individually.  The final row is deliberate in how cos(-x) and e^-x have both been put in.  This highlights the fact that cos(-x) equals cos(x) and therefore, one can argue that y = e^-x is in fact the odd one out.  

credit: @chrismcgrane84