y=lnx−3exy = \ln x - 3e^xy=lnx−3ex
Find dydx\displaystyle \frac{dy}{dx}dxdy
Find d2ydx2\displaystyle \frac{d^2y}{dx^2}dx2d2y
57 exam-style questions on Edexcel A Level Maths 9.9 Using Second Derivatives. Each one has a worked solution and a mark scheme showing where the marks go.