An integrating factor of the differential equation dydx=ytanx-y2secx is equal to:
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a
tan x
b
sec x
c
cosec x
d
cot x
answer is B.
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Detailed Solution
Consider the differential equationdydx=ytanx−y2secx Divide by y2 on both the sides, we get dydx=ytanx−y2secx Let 1y=z Differentiating both sides, we get: Put value of 1y2dydx in the equation(1), we get −dzdx−(tanx)z=−secx⇒dzdx+(tanx)z=secx This is of the form dzdx+P⋅z=Q then integrating factor =e∫Pdx∴ In the given question I.F. =e∫tanxdx=elog(secx)=secx