what is the difference between fog and gof ...?
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if f : a to b and g : b to c
then fog : c to a and gof : a to c
ex : if f is a function f(x) = 2x and g is function g(x) = 3x then
fog(x) = f(g(x)) = f(3x) = 2(3x)
gof(x) = g(f(x)) = g(2x) = 3(2x)
then fog : c to a and gof : a to c
ex : if f is a function f(x) = 2x and g is function g(x) = 3x then
fog(x) = f(g(x)) = f(3x) = 2(3x)
gof(x) = g(f(x)) = g(2x) = 3(2x)
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