Q.

The solution of the DE   cos⁡xdy=y(sin⁡x−y)dx,0

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a

tanx=(secx+c)y

b

secx=(tanx+c)y

c

ysecx=tanx+c

d

ytanx=secx+c

answer is B.

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Detailed Solution

dydx=ytanx−y2secx⇒1y2dydx−1ytan⁡x=−sec⁡xt=1ydtdx=⋅−1y2dydx→−dtdx−tan⁡xt=−sec⁡x→dtdx+(tan⁡x)t=secx I.F. =e∫tan⁡xdx=sec⁡xtsecx=∫sec2x dxtsecx=tan⁡x+c1ysec⁡x=tan⁡x+c
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