# How do you determine the amplitude and period for #y=-5 cos 6x#?

##### 1 Answer

Look at the coefficients of the function and the function variable respectively.

#### Explanation:

The "period" is the distance or time it takes for the function to complete one full cycle -

The amplitude is determined by the coefficient on the function -

The period is determined by the coefficient on the

Further explanation, examples and graphics here:

http://www.purplemath.com/modules/grphtrig.htm

Additional examples and practice problems here:

http://www.mathwarehouse.com/trigonometry/period-sine-cosine/how-equation-effects-graph.php