$\int\frac{7x-1}{6x^2+x-1}dx$

$\left(5ab^6\right)^2$

$\frac{1}{\sqrt{16x^2+4}}$

$\frac{dt}{dx}=\frac{2tx}{\left(t^2-x^2\right)}$

$\sin\left(5x\right)\sin\left(8x\right)\cos\left(5x\right)\cos\left(8x\right)$

$x^2\left(x-3\right)^2$