9. If f(x) 9x2 - x3, find f'(1) and use it to find an equation of the tangent line to the curve y 9x - x at the point (1, 8). Need Help? Watch It Talk to a Tutor 10. Find f (a). f(t) = St + 2 t+3 f (a) Need Help? Watch It Master It Talk to a Tutor The limit represents the derivative of some function f at some number a. State such an Fand a. cos(π + h) + 1 lim /(x) = cos(x), a = 0 〇#x) = cos(x), a = π/4 o rx) = cos(x), a = π/6 〇/(x) = cos(x), a = π ○ f(x)=cos(x), a = π/3 Need Help? Read ItWatch Talk to a Tutor 12 A particle moves along a straight line with equation of motion s = f(t), where s is measured in meters and t in seconds. Find the velocity and the speed when t = 2. f(t) = 17 +-24- t + 1 velocity speed m/s m/s Road ta Tutor

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