Always check for "illegal" math (denominators of zero or negatives in square roots).
Use a graphing calculator to verify your hand-drawn sketches, not replace them. Precalculus with Limits: A Graphing Approach
Compare the degrees of the numerator and denominator. 4. Trigonometry via the Unit Circle Coordinates: Remember Always check for "illegal" math (denominators of zero
Follow the line from both sides; if they meet at the same height, the limit exists. Algebraic View: Try direct substitution first; if you get , factor or rationalize. if you get
If a graph looks weird, plot 3-5 specific points to anchor it.