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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