1. The problem statement, all variables and given/known data The maximum deflection of a beam is given by the equation y=M/P(sec(μL/2)-1) μ=√(P/EI) Where EI Is a constant. Show that as P→0 y→ML^2/8EI This is a mathCAD problem by the way, but i'm very novice at it so i want to try formulise some sort of solution on paper before i attempt mathCAD 2. Relevant equations 3. The attempt at a solution I'm really stuck, firstly i would replace μ with √(P/EI) ∴y = M/P(sec(√(P/EI)*L)/2)-1) I think the next step is to try get the EI out the function as it is a constant and doesnt need to be differntiated. The derivivative of secx is tanxsecx which is the same as tanx/cosx and as x approaches 0 the function will equal 0/1 which is 0 If someone could point me in the right direction it would be much appreciated !