Consider function f: [ 0,π/2] ->R given by f( x) = sinx and g:[0,π/2]

This question was asked in Example 26

Consider function f: [ 0,π/2] ->R given by f( x) = sinx and g:[0,π/2] ->R given by g(x)=cos(x) show graphically that f and g are one-one but f+g is not one-one