Use proof by contradiction to prove that the curve with equation
y=3x+x5+sinx y = 3x + x^5 + \sin x y=3x+x5+sinxhas no stationary points.
107 exam-style questions on WJEC A Level Maths 3.1.1 Proof (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.