Question 681877
(gof)(x) = {{{((2/(1-x))-2)/(2/(1-x))}}}
 = {{{((2/(1-x))-2)((1-x)/2)}}}
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 = {{{((2/(1-x))-2((1-x)/(1-x)))((1-x)/2)}}}
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 = {{{((2-2(1-x))/(1-x))((1-x)/2)}}}
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 = {{{((2-2+2x)/(1-x))((1-x)/2)}}}
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 = {{{(cross(2)x/cross((1-x)))(cross((1-x))/cross(2))}}}
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 = x
(fog)(x) = {{{2/(1-((x-2)/x))}}}
 = {{{2/(1(x/x) - ((x-2)/x))}}}
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 = {{{2/((x-(x-2))/x))}}}
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 = {{{2/((x-x+2)/x)}}}
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 = {{{cross(2)(x/cross(2))}}}
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 = x
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