Trigonometry

Mathematics J.S.S 3 Second Term

Theme: Algebraic Process

Sub Theme: Algebraic Operation

WEEK 9

Trigonometry

Performance Objectives

Students should be able to;

1. Identify Sine and cosine of an acute angle
2. Solve problems on application of trig ratios to finding distance and lengths
3. Apply trig in solving word problems.

Sine and Cosine of an Acute

Content

Sine (abbreviated “sin“) and cosine (“cos“) are the two most prominent trigonometric functions. All other trig functions can be expressed in terms of them. In fact, the sine and cosine functions are closely related and can be expressed in terms of each other.

Definition 1 is the simplest and most intuitive definition of the sine and cosine function. The sine definition basically says that, on a…