Since ATP is not directly involved in the functioning of a cotransporter. Why?
Cotransport is an active transport though it does not exploit ATP directly. Cotransport also known as secondary active transport because when an active transporter uses ATP to transport molecules or ions simultaneously secondary molecules pass combindly through the transporter, so it is considered that cotransporte is an active transport. You can compare Uniport, Simport, Antiport.
An interesting example is the SGLT1 (Sodium-Glucose Transporter 1) which is a secondary active transport, also known as coupled transport or co-transport, energy is used to transport molecules across a membrane; however, in contrast to primary active transport, there is no direct coupling of ATP.
In this way SGLT1, co-transports one glucose (or galactose) molecule into the cell for every two sodium ions it imports into the cell, and is associated with a membrane ATPase. This symporter is not only very important in the small intestine cells, but also in trachea, heart, brain, testis, or prostate.
See more information at the following link
http://physrev.physiology.org/content/91/2/733
i am agree with Syed Raju Ali ,active transporter uses ATP to transport molecules or ions simultaneously secondary molecules pass combindly through the transporter
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