EAMCET Engineering 2008 Solved Paper

Section: Mathematics
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Question : 150 of 160
 
Marks: +1, -0
If z= sec−1(‌
x4+y4−8x2y2
x2+y2
)
,‌‌
then x‌
∂z
∂x
+y‌
∂z
∂y
is equal to
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