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The Special Triangles
The Special Triangles
For certain angles, trig values can be written exactly using surds and fractions - no decimals needed! These come from two special triangles: the 45-45-90 isosceles and the 30-60-90 from splitting an equilateral. Learn the pattern - you WILL need these!
Now try it yourself
Quiz · Question 1 of 14
What is the exact value of sin 30°?
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This topic in real past papers
Every real exam question we've found on exact trig values, with a full worked answer.