I was asked to prove the result of increasing and decreasing function on the composite function...
prove that:
1- if f(X) inc & g(X) inc, foG inc
2-if F(X) inc & G(X) dec, foG dec
3- if F(X) dec & G(X) inc, fog dec
4- if f(X) dec & G(X) dec, fog inc
please help me in that