UPSC NDA 2 2012 Mathematics Paper

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Question : 90 of 120

Marks: +1, -0

What is the general solution of the differential equation ex‌tan‌y‌dx+(1−ex) sec2ydy=0 ?

sin‌y=c(1−ex)
cos‌y=c(1−ex)
cot‌y=c(1−ex)
None of the above
where c is the constant of integration.

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