Mathematics for IGCSE & O level - Graphs Of Functions (Section 3 - No. 37)
Which is the most suitable way of drawing a tangent line?
Make the tangent shorter than the curve.
Make sure the tangent does not touch the curve.
Try to move your ruler so there is an equal amount of space between the curve and the tangent on each side of the given point.
Make the tangent line steeper than the curve.
Explanation
To draw as good a tangent as possible, try to move your ruler so you have an equal amount of space between the curve and the tangent on each side of the given point.
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