$\text { Given } f ( x , y ) = x \cos y \text {, calculate } \Delta z \text { by evaluating } f ( 4,6 ) \text { and } f ( 2.3,1.05 ) \text {. }$

Multiple Choice

$\text { Given } f ( x , y ) = x \cos y \text {, calculate } \Delta z \text { by evaluating } f ( 4,6 ) \text { and } f ( 2.3,1.05 ) \text {. }$ Round your answer to four decimal places.

A) 7.3037
B) 5.6074
C) -16.6963
D) -2.6963
E) -21.3926