Note:- 1) If y = x^n ; where n = constant ; then dy/dx = n*x^(n-1)
`f(x) = 27/x^3`
`f'(x) = -81/x^4`
``Now, slope of the graph = f'(x)
Hence slope at (3,1) = f'(3) = `-81/3^4`
`or, f'(3) = -81/81 = -1`
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