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 OCR A Level Maths 1.1 Proof, covering 1.1.1 Structure of mathematical proof, 1.1.2 Logical connectives, 1.1.3 Disproof by counter example, 1.1.4 Proof by contradiction (A-level only), and 1.1 Proof. Each one has a worked solution and a mark scheme showing where the marks go.