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f(x)=ln(1-1/x^2)
f(2)+f(3)+f(4)=ln(5/8)
f(2)=ln(1-1/2^2)=ln(1-1/4)=ln(3/4)
f(3)=ln(1-1/3^2)=ln(1-1/9)=ln(8/9)
f(4)=ln(1-1/4^2)=ln(1-1/16)=ln(15/16)
f(2)+f(3)+f(4)=ln(3/4)+ln(8/9)+ln(15/16)
f(2)+f(3)+f(4)=ln((3/4)(8/9)(15/16))
f(2)+f(3)+f(4)=ln((3/4)(8/9)(15/16))...simplify
f(2)+f(3)+f(4)=ln((1/4)(1/1)(5/2))
f(2)+f(3)+f(4)=ln(5/(4*1*2))
f(2)+f(3)+f(4)=ln(5/8) ->proven