$\frac{1}{\left(k+n\right)\left(n+k+1\right)}$
$\left(3\right)\left(5\right)-\left(1\right)\left(3\right)$
$17b=289$
$\ln\sqrt{\frac{x^2}{y^3}}$
$\left(ab^2+b\right)\left(ab^2-b\right)$
$\left(x+\sqrt{x}\right)\frac{dy}{dx}$
$-5+-2y=-1$
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