Solve the differential equation.y ' + y tan x = cos x, -?/2 < x < ?/2
A. y = x cos x + C cos x, -?/2 < x < ?/2
B. y = x cos x + C sin x, -?/2 < x < ?/2
C. y = x sin x + C sin x, -?/2 < x < ?/2
D. y = x sin x + C cos x, -?/2 < x < ?/2
Answer: A
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