1. Find an equation of the tangent line to the graph of f(x) = 4π - tanx when x = π. Simplify your answer as much as possible, but do not approximate π.
2. Find an equation of the tangent line to the graph of f(x) = 2sinx - π when x = π. Simplify your answer as much as possible, but do not approximate π.
3. Find an equation of the tangent line to the graph of f(x) = 4cosx when. Simplify your answer as much as possible, but do not approximate π.