[tex]\pi[/tex]Answer:
y=1/2sin(1/2 x).
Step-by-step explanation:
Remember that the period is 2[tex]\pi[/tex]/b so the number before the x in the parentheses is b so 2[tex]\pi[/tex]/1/2 is 4[tex]\pi[/tex]. The number before sin is the amplitude, which does not matter in this problem.
