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Not exactly sure where this came from originally but it's on a sheet our teacher gave us :) And....i have no idea how to do it: Given that 0 < x < π/4 , prove that tan(π/4 + x) = ( cosx + sinx )/( cosx - sinx )

I'm trying to figure out my subjects for year 11, and so far i've got this: English Advanced - 2 English Extension - 1 Mathematics - 2 Mathematics Extension - 1 Modern History - 2 Either Physics or Chemistry - 2 which is ten units. Problem is i also really want to do Society and Culture...