Prove that:
sec4x−tan4x≡1+2tan2x\sec^4x - \tan^4x \equiv 1 + 2\tan^2xsec4x−tan4x≡1+2tan2x
Hence solve, for 0≤x≤3600 \leq x \leq 3600≤x≤360, the equation,
sec4x−tan4x=3 \sec^4x - \tan^4x = 3 sec4x−tan4x=397 exam-style questions on WJEC A Level Maths 1.5 Trigonometry, covering 1.5.1 Trigonometry, 1.5.2 Trigonometry, 1.5.3 Trigonometry, 1.5.4 Trigonometry, and 1.5.5 Trigonometry. Each one has a worked solution and a mark scheme showing where the marks go.