Question 9 Determine the solution of the differential equation y"+y = sec2 x y = C, cos x + C2 sin x – cos x In(sec x+ tan x) - a. b. y = C, cos x + C2 sin x + cos x In(sec x + tan x) y = C, cos x + C2 sin x – sin x In(secx + tan x) - c. %3D y = C, cos x + C2 sin x + sin x In(sec x + tan x) d.

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