Basic derivative formula
dy/dx cxn = (cn)xn-1
Product rule
dy/dx cxn * bxn = cxn(dy/dx bxn) + bxn(dy/dx cxn)
Quotient rule
dy/dx cxn/bxn = [(dy/dx bxn * cxn) - (dy/dx cxn * bxn)]/[(bxn)2]