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Sin 60° = √Fingers below 60° finger/2 = √3/2 Cos 90° = √Fingers above 90° finger/2 = √0/2 = 0 To calculate the tan ratios, flip the hand and assign the angles as shown below.
Revise trigonometric ratios of sine, cosine and tangent and calculate angles in right-angled triangles with this Bitesize GCSE Maths Edexcel guide.
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