

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 | |