Find 
and 
.f(x, y) = sin2 (2xy2 - y)
A. 
= 4y2sin (2xy2 - y) cos (2xy2 - y); 
= 2sin (2xy2 - y) cos (2xy2 - y)
B. 
= 2sin (2xy2 - y) cos (2xy2 - y); 
= (8x - 2) sin (2xy2 - y) cos (2xy2 - y)
C. 
= 2sin (2xy2 - y) cos (2xy2 - y); 
= 2sin(2xy2 - y) cos(2xy2 - y)
D. 
= 4y2sin (2xy2 - y) cos (2xy2 - y); 
= (8xy - 2) sin (2xy2 - y) cos (2xy2 - y)
Answer: D
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B. 
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