The curve C C\,C has equation y=13x3−9x+1\displaystyle y = \frac{1}{3}x^3 - 9x + 1y=31x3−9x+1
Find dydx\displaystyle \frac{dy}{dx}dxdy
Find the range of values of x x\,x for which C C\,C has a negative gradient.
5 exam-style questions on Edexcel IGCSE Maths Differentiation. Each one has a worked solution and a mark scheme showing where the marks go.