Use the table to answer the question.
x 0 3π4
3π2
9π4
3π
f(x)
1 0 −1
0 1
Write the equation of the periodic function represented in the following table.
(1 point)
Responses
f(x)=cos(x3)
f left parenthesis x right parenthesis equals cosine left parenthesis Start Fraction x over 3 End Fraction right parenthesis
f(x)=sin(x3)
f left parenthesis x right parenthesis equals sine left parenthesis Start Fraction x over 3 End Fraction right parenthesis
f(x)=cos(2x3)
f left parenthesis x right parenthesis equals cosine left parenthesis Start Fraction 2 x over 3 End Fraction right parenthesis
f(x)=sin(2x3)