Slope of tangent line Given the function f(x) = 1 − cos x and the points A(π/2, f(π/2)), B(π/2 + 0.05, (π/2 + 0.05)), C(π/2 + 0.5, f(π/2 + 0.5)), and D(π, f(π)) (see figure), find the slopes of the secant lines through A and D, A and C. and A and B. Then use your calculations to make a conjecture about the slope of the line tangent to the graph of f at x = π/2.
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