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A curve has equation y = f(x). (a) Write an expression for the slope of the secant line through the points P(9, f(9)) and Q(x, f(x)). Of(9) – 9 f(x)  Of(x) – f(9) X 9 (b) Write an expression for the slope of the tangent line at P. o lim fit o lim f(x) – 1(9) X9 X  9 o limo rent = PRO O lim x ?0 f(x) – f(9) X – 9
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