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.
Write your answer to part (a) correct to 3 significant figures.
Practise Oxford AQA IGCSE Maths Using a Calculator with exam-style questions for Core and Extended tier. 14 questions, matched to the Oxford AQA IGCSE Maths (9260) specification and written in Paper 1 and Paper 2 (Core: 1C and 2C; Extension: 1E and 2E) style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.