Find 
and 
.f(x, y) = 
A. 
= 
; 
= 
B. 
= - 
; 
= - 
C. 
= - 
; 
= - 
D. 
= - 
; 
= - 
Answer: B
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A. 6 cis 180°, 6 cis 0°
B. 6 cis 90°, 6 cis 270°
C. 6
cis 235°, 6
cis 135°
D. 6
cis 45°, 6
cis 225°