| definition | Definition |
| If f is defined on (a,b) containing c then the lim as deltax approaches 0 =f(x+deltax)-f(c) over deltax=m then the line passing through (c, f(c)) w/slope m is the tan line to graph | |
| If f is cont at c and f(c+deltax)-f(c) over deltax=p/m infinity then the vertical line x=c is a vertical tan line | |
| f'(x)=lim as deltax approaches 0 f(x+deltax)-f(x)over deltax | |
| deltay over delta x is the slope of a sec line but the lim as x approaches 0 delta y over delta x is the slope of a tan line | |
| f'(c) = lim as x approaches c f(x) -f(c) over x-c | |
| implies continuity but not vice versa | |