4. The relationship between the rising height 3 and time t of an object thrown vertically at the initial 1 velocity 1:0 is s = vot Egt2,find: (a) The speed 190$) ofthe object, (b) The time that the object reaches its highest point. 5. Use the first definition of derivative to show that (cosx)' = -sinx. 6. dy Let f(x) be differentiable, find the derivative - of the following function as a function of f', (a) y =f(x2 ) (b) y = f(sin'x) +f(cos?)