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1. Differentiate. Simplify answers. \text { (a) } f(x)=5-7(x-2)(x-3) \text { (b) }(3+4 x)^{3} \text { (c) } f(t)=t^{5}-\pi^{3} \text { (d) } \mathrm{y}=\frac{1}{x}+\frac{1}{x^{2}}+\frac{1}{x^{3}} \text { (e) } f(x)=\frac{3 x-4}{x^{2}+5} \text { (f) } y=\left(\frac{\pi-x}{6 \pi+x}\right)^{\frac{1}{3}}
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