Use the method of variation of parameters to solve the differential equation.y'' + y = sec2 x
A. y = C1 cos x + C2 sin x - 1 + cos x ln|sec x + tan x|
B. y = C1 cos x + C2 sin x - 1 + sin x ln|sec x + tan x|
C. y = C1 cos x + C2 sin x - sec x sin x + cos x ln|sec x + tan x|
D. y = C1 cos x + C2 sin x - sec x sin x + sin x ln|csc x + cot x|
Answer: B
Mathematics
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