When I need to type in both “x” and “y” or “e” there is only one key with an arrow in the corner, but I can’t find a way to change between the letters.
You should be able to access the other variables (in addition to Euler's number) by pressing down and holding on the key with an arrow in the corner (the key likely has x as the default variable).
კომენტარის დასატოვებლად გთხოვთ გაიაროთ ავტორიზაცია.