When x x\,x is small, show that tan(x)cos(x)\tan(x) \cos(x)tan(x)cos(x) can be approximated by x−x36\displaystyle x - \frac{x^3}{6}x−6x3
278 exam-style questions on Edexcel A Level Maths Radians, covering 5.1 Radian Measure, 5.2 Arc Length, 5.3 Areas of Sectors and Segments, 5.4 Solving Trigonometric Equations, and 5.5 Small Angle Approximations. Each one has a worked solution and a mark scheme showing where the marks go.