Which function is shown on the graph?
Responses

f(x)=12cosx
f open argument x close argument equals one half cosine of x

f(x)=−12cosx
f open argument x close argument equals negative one half cosine of x

f(x)=12sinx
f open argument x close argument equals one half sine of x

f(x)=−12sinx
f open argument x close argument equals negative one half sine of x
A sinusoidal function with an x axis beginning at negative pi over two and increasing in increments of pi over two until reaching five pi over two. The function begins at negative pi over two comma zero and increases to a maximum value of zero comma zero point five and then decreases through pi over two comma zero to a minimum value of pi comma negative zero point five. The graph then increases through three pi over two comma zero to a maximum value of two pi comma zero point five and then decreases through five pi over two comma zero.