Q.
Let y=y(x) be the solution of the differential equation sinxdydx+ycosx=4x,∈(0,π). If yπ2=0, then yπ6 is equal to
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a
−49π2
b
493π2
c
−893π2
d
−89π2
answer is D.
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Detailed Solution
Given that sinxdydx+ycosx=4x⇒ddxysinx=4xIntegration on both sides∫dysinx=∫4xdx⇒ysinx=4x22+C⇒ysinx=2x2+C Given yπ2=0C=−π22 Thus ysinx=2x2-π22 Now ysinπ6=2π236-π22⇒y·12=π218−π22⇒y2=−8π218∴y=−8π29
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