How are vertical asymptotes generally drawn on the graph of a trigonometric function? What variable is generally used when writing the equation of a vertical asymptote?
For the function f(x)=tan(x/2), list two vertical asymptotes.

set the denominator equal to zero and then solve for x

in geometry, parallel lines are lines in a plane which do not meet; that is, two lines in a plane that do not intersect or touch each other at any point are said to be parallel. by extension, a line and a plane, or two planes, in three-dimensional euclidean space that do not share a point are said to be parallel.

i'm assuming that it's c.)   volcanoes built the mountains and earthquakes tore them down.