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5 Key Points
Sine? or Cosine?
Formulas
100
What is the first step in finding a sine/cosine graph?
Find your left and right endpoints
100
Is y=a sin (bx +/- c) +/- d sine or cosine?
Sine
100
What is this formula? bx +/- c = 0 and bx +/- c = 2π
Left and right endpoints
200
What is the second step?
Find period
200
Is the y-values (0,1,0,-1,0) cosine or sine?
Sine
200
What is this formula? 2π/b
Period
300
What is the third step?
Find the magic number
300
Is y=a cos (bx +/- c) +/- d sine or cosine?
Cosine
300
What is this function? period/4
Magic number
400
What is fourth step?
Write down normal y-values
400
Are the y-values (1,0,-1,0,1) sine or cosine?
Cosine
400
What is this function? x= left endpoint, left magic number, + magic number, + magic number, right endpoint
Finding x values
500
What is the fifth step? (not always necessary)
Multiply by A and add D
500
Which function (sine or cosine) has a midpoint between the asymptotes that is an x-intercept?
Neither, it is tangent.
500
What is the formula for finding y?
Normals, x A, + D