1.

The differential equation of minimum order by eliminating the arbitrary constants A and C in the equation y = A [sin (x + C) + cos (x + C)] is

A. y” + (sin x + cos x) y’ = 1
B. y” = (sin x + cos x) y’
C. y” = (y’)2 + sin x cos x
D. y” + y = 0
Answer» E.


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