Sine and cosine

Sine is using the opposite side dived by the hypotenuse. Cosine is using the adjacent side divided by the hypotenuse.  When we solve a triangle, it is really helpful to use sine cosine and tangent.  When we draw a graph for sine and cosine, the basic equation is y=ASine or Cosine (Bx+C) 

Where A is the amplitude of the graph. To get the period of the graph, we use the formula 2pi/B.  If we need to know the phase shift, we set Bx+C equals to zero and solve for x.  It is the same for both sine and cosine graph.