Question

The graph below represents which of the following functions? ਜਾ ST 25 जए TT 3 3 G 3 3 7 O A. y = -3 cos2x+ ---3008/21 O -(-4) O C. y = 3 sin(2[x = 1) / B. y = 3 cos 2 * = 2 +

Answer 1

Notice that two of the intersections of the function with the x-axis are x=-pi/3 and x=2pi/3.

Therefore, in the case of each of the options,

`\begin{gathered} A)-3\cos (2(-(\pi)/(3))+(\pi)/(3))=-3\cos (-(\pi)/(3))\\e0 \\ B)3\cos (2(-(\pi)/(3)-(\pi)/(3))=3\cos (-(4)/(3)\pi)\\e0 \\ C)3\sin (2(-(\pi)/(3)+(\pi)/(3)))=3\sin (0)=0 \end{gathered}`

Thus, the answer is option C.