A function 
is given.
Find the range and draw the graph of the 
function.
Calculate the tangent of the angle between the graph of the 
function and the line 
at the intersection with the positive abscissa.
Calculate the area of the figure enclosed by the graph of the function and the lines:
Find the points on the graph of the function that are 
away from the horizontal asymptote of this function.
function is:
