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Question

If u=tan1(x+y) then xux+yuy=

A
sin2u
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B
(1/2)sin2u
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C
2tanu
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D
sec2u
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Solution

The correct option is B (1/2)sin2u

tanu=x+y

tanu is a homogeneous of degree=1

x d tanudx=ntanu

sec2uxdudx=tanu

xdydx=12sin2u


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