Solution of the differential equation \( \tan y \sec ^{2} x d x+\ta...

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Solution of the differential equation \( \tan y \sec ^{2} x d x+\tan x \sec ^{2} y d y=0 \) is :
(A) \( \tan x+\tan y=k \)
(B) \( \tan x-\tan y=k \)
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WV
(C) \( \frac{\tan x}{\tan y}=k \)
(D) \( \tan x \cdot \tan y=k \)
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