Which of the following could be the equation of the function?
A
y is equal to 0 point 5 cosine open paren 4 times open paren x plus pi over 2 close paren close paren minus 2B
y is equal to 0 point 5 cosine open paren 2 times open paren x minus pi over 2 close paren close paren plus 2C
y is equal to 0 point 5 cosine open paren 2 times open paren x minus pi close paren close paren minus 2D
y is equal to 0 point 5 cosine open paren 4 times open paren x plus pi close paren close paren plus 2