I am using google map in order i can show a route between my place and another marker place , i use the displayDirections function like this it works

var sourceAddress = "London";

var destinationAddress = "Paris";

displayDirections(sourceAddress, destinationAddress, map);

but now i need to have the sourceAddress to be my latitude/longitude and the destinationAddress to be another pair of coordination instead of names
how can i do this?
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