2. Find dy (use product rule) if dx y = (75x3) 3x +7 (Note: VA = A3 and d c.un = c n un-1. du Chain Rule) dx dx 1. Find the derivative by the delta method of one of the following. y = 3-5x2 [8 Marks] 3. Find the slope of the straight line Normal to the curve of x+7x y = x3 at x = 2 (work out the derivative using quotient rule). (Hint: du dx 2u dx [8 ma 4. Write the equations of the tangent and normal to the curve x + y = 25 at the point (3,4) [8 marks]