Choose the function whose graph is given by (inside!)

A. y = cos(2x)

B. y = cos(1/2x)

C. y = cos(1/4x)

D. y = cos(4x)

***i honestly am not too sure on this one :( can u pls explain? :D

Question

Choose the function whose graph is given by (inside!)

A.       y = cos(2x)

B.       y = cos(1/2x)

 C.      y = cos(1/4x)

D.       y = cos(4x)

***i honestly am not too sure on this one :( can u pls explain? :D

anonymous · Answer

GRAPH!

anonymous · Answer

this has to do with the period of trig functions. you know the period of cosine (and also sine) is 2pi. so to find the period of any graph, the equation is 2pi over (the period shown in the graph) and thats what you put inside the parenthesis of the actual equation.

anonymous · Answer

okay, im confused how to get to the answer though... like how do i put it in?

anonymous · Answer

the period of this graph is pi/2. so, |dw:1364420721339:dw|

does this make sense?