Question: ( 3 . 2 ) Show that ( 7 ) ( 2 x y - s e c 2 x ) d x + (

(3.2) Show that
(7)
(2xy-sec2x)dx+(x2+2y)dy=0
is an exact differential equation, and hence find a solution in the form f(x,y)=c.
( 3 . 2 ) Show that ( 7 ) ( 2 x y - s e c 2 x ) d

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