Use the method of variation of parameters to solve the differential equation.y'' + y = sec x tan x
A. y = C1 cos x + C2 sin x - sin x(x + tan x) + sin x ln|csc x|
B. y = C1 cos x + C2 sin x + sin x(x - tan x) + cos x ln|sec x|
C. y = C1 cos x + C2 sin x + cos x(x - tan x) + sin x ln|sec x|
D. y = C1 cos x + C2 sin x + cos x(x - tan x) + cos x ln|sec x|
Answer: C
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