Creating vectors and extracting com

Creating vectors and extracting components

Whenever two numbers or expressions are put inside a parenthesis with ',' in between, it will be interpreted as a vector with components x and y.
Example: (2, 3) ; (t - sin t, 1 - cos t)
Conversely, given a vector (x, y), the function '.x' extracts the x component (note that function symbol is written on the right side of the component). For example,
.x : x component of the vector (2, 3) is (2, 3).x = 2
.y : y component of the vector (2, 3) is (2, 3).y = 3