(a) Find $$\(\frac{\mathrm{d} y}{\mathrm{~d} x}\)$$ $$\[ \frac{\mathrm{d} y}{\mathrm{~d} x}= \]$$ ................................................................ (2) C is the curve with equation $$\(y=x^{3}-2 x^{2}-15 x+5\)$$ (b) Work out the range of values of $$\(x\)$$ for which $$\(\mathbf{C}\)$$ has a negative gradient. ................................................................ (4)

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