EAMCET Engineering 2006 Solved Paper

Section: Mathematics

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Question : 151 of 160

Marks: +1, -0

If f(x,y)=‌

cos(x−4y)

cos(x+4y)

, then ‌

∂f

∂xy=‌

x

2

is equal to :

−1
0
1
2

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