Solution of the differential equation sec2 x tan⁡y dx + sec2 y tan� – McqOptions

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1.	Solution of the differential equation sec2 x tan⁡y dx + sec2 y tan⁡x dy=0 is _______
A.	(sec x. sec y)=k
B.	(sec x .tany)=k
C.	(tan x. tany)=k
D.	(sec x .tan x)+(sec y .tan y)=k
Answer» D. (sec x .tan x)+(sec y .tan y)=k

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