Graphs of Trigonometric Functions
Functions that repeat themselves after a certain interval are called periodic functions
The Sine Function
The Cosine Function
The Tangent Function
Representing angles on the x, y plane
Positive angles go clockwise
Negative angles go anti-clockwise but relate to the graph in the same way
Negative angles go anti-clockwise but relate to the graph in the same way
Sine Quadrants
This means sine values can be discovered:
sin240 = - sin60
sin240 = - sin60
Cosine Quadrants
This means cosine values can be discovered:
cos545 = -cos5
cos545 = -cos5
Tangent Quadrants
This means tangent values can be discovered:
tan 15π = -tan π
8 8
tan 15π = -tan π
8 8