Use your calculator to work out tan80∘+1tan80∘−1\displaystyle \sqrt{\frac{\tan 80^\circ + 1}{\tan 80^\circ - 1}}tan80∘−1tan80∘+1
Write down all the figures on your calculator display and give your answer correct to 3 significant figures.
192 exam-style questions on OCR GCSE Maths Using a Calculator. Each one has a worked solution and a mark scheme showing where the marks go.