Use the given pair of functions to find the following values if they exist.

Use the given pair of functions to find the following values if they exist. I need all the steps for the equation.
a. (g o f )(0) b. (f o g)(−1) c. (f o f )(2)
d. (g o f )(−3) e. (f o g) ( 1 / d. (f o f )(−2)
f(x) = 4 – x, g(x) = 1 – x2

 
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