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For the following function, make a table of slopes of secant lines and make a conjecture about the slope of the tangent line at the indicated point. f(x) = 21 cos x at x = R IN . . . Complete the table below. (Round the final answer to three decimal places as needed. Round all intermediate values to four decimal places as needed.) Interval Slope of secant line RIN 4 '2 + 0.1 + 0.01 2' - + 0.001 2'2 + 0.0001 An accurate conjecture for the slope of the tangent line is (Type an integer or a decimal.)