Question

PLEASE HELP ME WITH GRAPHING!


How do you graph:
f(x)=-cos(x/4)???

Answer 1

https://www.desmos.com/calculator
good place to check work

Answer 2

Also, how do you know when the A value is the vertical stretch or the amplitude?

Answer 3

I don't want to know what the graph looks like, I need to graph it without a graphing calculator.

Answer 4

Whenever you graph a trig function, you should start by graphing the base function and then adding the stretches, shrinks, etc.

Answer 5

I understand what to do with the vertical and horizontal shifts, but I don't understand the periodocity or amplitude.

Answer 6

The (x/4) indicates that the period of the function is increased by a factor of 4. The period of the cos is 2pi so the period of this transformation would be 8pi.

Answer 7

I also found this really confusing. So when you think of period, think of trying to maintain the same output in the trig function. If you have cos(x/4), you would need x to be 4 times as large to get the same value of cos(x)

Answer 8

Ohhhh okay, that makes some more sense.