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Question

The general solution of the differential equation ydxxdy+x2.sinydy+(1+x2)dx=0, is equal to:

A
x2=(c+1)x+x.cosyy
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B
x2=(c+1)x+x.cosy+y
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C
x2=cx+x.cosy+y1
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D
x2=cx+x.cosy+y+1
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Solution

The correct option is A x2=(c+1)x+x.cosyy
ydxxdy+x2sinydy+(1+x2)dx=0
Dividing by x2, we get
sinydy+1+x2x2dx=xdyydxx2
sinydy+(1x2+1)dx=d(yx)
Now by integrating, we get
cosy+1x+x=yx+C
x2=(C+1)x+xcosyy

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