a.
\(y'=4x^3-8x\)
b.
\(y'=\dfrac{2\left(5x+1\right)-5\left(2x-3\right)}{\left(5x+1\right)^2}=\dfrac{17}{\left(5x+1\right)^2}\)
c.
\(y'=\dfrac{\left(2x+1\right)\left(2x-1\right)-2\left(x^2+x-3\right)}{\left(2x-1\right)^2}=\dfrac{2x^2-2x+5}{\left(2x-1\right)^2}\)
d.
\(y'=\dfrac{\left(x^2-2x\right)'}{2\sqrt{x^2-2x+5}}=\dfrac{x-1}{\sqrt{x^2-2x+5}}\)
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