TRIGONOMETRIC RATIO

FURTHER MATHEMATICS SSS1 SECOND TERM

WEEK 8

TRIGONOMETRIC RATIO

Content

5. Basic trigonometric Ratio
5. The ratio of General Angle
5. Trigonometric Identities

 

BASIC TRIGONOMETRIC RATIO

The basic trigonometric ratios can be defined in terms of the sides of a right-angled triangle.

 Note that:      

  1.  In the first quadrant, all the ratios are positive.

  2.  In the second quadrant, only sine ratio is positive, while the rest are negative.

  3.  In the third quadrant, only tangent ratio is positive, while the rest are negative.

  4.  In the fourth quadrant, only cosine ratio is positive, while the rest are negative.

 

Evaluation                                     

1. Use tables to evaluate the following   (a) Sin 162⁰  (b) Cos 283⁰  (c)…