Trigonometry

• The graph of y=sinx is periodic as it keeps repeating.
• How often a graph repeats is called a period.
• y=sinx has a period of 360 degrees.
• The graph of y=sinx has rotational symmetry about the origin by 180 degrees.
• y=cosx has a period of 360 degrees.
• The graph if y=cosx is symmetrical in the y axis.
• y=tanx has a period of 180 degrees
• y=tanx has asymptotes at 90 degrees +/- n180 degrees, where n is an integer
• The graph of y=tanx has rotational symmetry about the origin by 180 degrees.