# What is the equation of the tangent line of #f(x) =tan^2x*sec2x-e^xcosx# at #x=pi/4#?

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The equation of the tangent line of f(x) = tan^2x * sec^2x - e^x * cosx at x = pi/4 is y = -2 + sqrt(2) + (3 - sqrt(2)) * (x - pi/4).

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