6. dyldr =ry-xy. [Gorakhpur 2005] Ans. y =x+1 + ce 7. (dyldr) - y sec x =¥ sin x cos x. 8. dvldbx +y =xy'. [Delhi B.Sc. (Hons) II 2011] 9. x-) dr +21xy dy = 0. Ans. y' (sec x+tan x) = coS x- (x/2) +(1/4) sin 2x +C Ans. y=x + 1/2 +t ce Ans. y +x log (cr) =0