(d/dx (1+cos^2 x)/(cos^7 x)) - (sin2x + 2tan x)/(cos^6 x + 6 cos^2 x + 4)(d/dx (1+cos^2 x)/(cos^7 x)) - (sin2x + 2tan x)/(cos^6 x + 6 cos^2 x + 4)

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