Show that
cos3x≡4cos3x−3cosx \cos 3x \equiv 4\cos^3 x - 3\cos x cos3x≡4cos3x−3cosxHence find, using algebraic integration,
∫0π6cos3x dx \int_{0}^{\frac{\pi}{6}} \cos^3 x \, dx ∫06πcos3xdx363 exam-style questions on CCEA A Level Maths 3.6 Integration (A-level only), covering 3.6.1 Integration (A-level only), 3.6.2 Integration (A-level only), 3.6.3 Integration (A-level only), 3.6.4 Integration (A-level only), 3.6.5 Integration (A-level only), 3.6.6 Integration (A-level only), and 3.6.7 Integration (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.