Let f(x) be a polynomial function of degree 6 such that 
 
 
 ASSERTION (A): f (xdy) has a minimum at x = 1. 
 REASON (R): When 
where 'h' is an infinitesimally small positive quantity, then f (x) has a minimum at x=a, provided f(x) is continuous at x=a .
                    
            
            Solution
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