Applying variation of parameters to the DE: y+y tan x, we get the following system of equations: u cos x + u, sin x = 0 -u, sin x + u, cos x tan x What are u1 and u2? (u1 and u2 are functions of x.) O u1 = sin z- In(tan r + sec z); u2 = - cos a O u =-sec r tan r; u2 = In cos r sin? 2 u1 = cos x tan x; u2 = Cos x O uj = – sec x + cos r; u2 In tan x

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