For the function ​f(x)=2x3-x. make a table of slopes of secant lines and make a conjecture about the slope of the tangen

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For the function
​f(x)=2x3-x.
make a table of slopes of secant lines and make a conjecture about the slope of the tangent line at x=1
complete the table:
interval: Slope of secant line
[1,2]
[1,1.5]
[1,1.1]
[1,1.01]
[1,1.001]
an accurate conjecture for the slope of the tangent line at x=1 is: _____