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Given that `f(x)=5 x -4` and `g(x)=6 - x^2`, calculate
(a) `(f \circ g)(-5)`=  
(b) `(g \circ f)(-5)`=  
(c) `(f \circ f)(-5)`=  
(d) `(g \circ g)(-5)`=  


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