zero
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False
If the graph of the function is a continuous line then the function is differentiable. Also if the graph suddenly make a deviation at any point then the function is not differentiable at that point . The slope of a tangent at any point of the graph gives the derivative of the function at that point.
true
Any 2 points you designate as 'A' and 'B' can represent those 2 points.
The answer depends on what is used to reflect the point: a horizontal line, a vertical line, y = x or simply any line.