1.

The solution the differential equation `"cos x sin y dx" + "sin x cos y dy" =0` isA. `(sinx)/(siny) = c`B. `cos x + cos y = c`C. `sin x + sin y = c`D. `sin x. sin y=c`

Answer» Correct Answer - 4
`"cos x sin y dx + sin x cosy dy" =0`
`"sin y d(sinx) + sin x d (sin y)=0"`
`"d (sin x sin y) =0"`
Intergrating
`sin x sin y =c`


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