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Contents
Ratio for Special Angles
Ratio for Complementary Angles
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Trigonometric Ratios of Special Angles The trigonometric ratios of the angles 30°, 45° and 60° are often used in mechanics and other branches of mathematics. So it is useful to have their values in surd form.
A square ABCD, is drawn, with sides of a unit length. AC, a diagonal, is drawn.
An equilateral triangle, ABC, of sides 2 units in length, is drawn. AD is drawn from A perpendicular to BC.
Example
a) tan 45° + tan 30° tan 60°
b)
  a) 1 + 1/Ö3 x Ö3/1
= 2 b)
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Without using a calculator, evaluate 
