Choose the correct equation for the function of the graph shown below.
y=1/2cos4x y=-1/4sin2x y=-1/2cos4x y=1/4sin2x
![Choose the correct equation for the function of the graph shown below y12cos4x y14sin2x y12cos4x y14sin2x class=](https://us-static.z-dn.net/files/d5f/ea05761db83c0fc4ac6a2037905d0b61.png)