$x^2+6x\cdot6$

$\int\frac{t^3}{\sqrt{16+t^4}}dx$

$\left(7^{\frac{1}{4}}\cdot7^{\frac{1}{2}}\right)^2$

$\int\sin^8dx$

$\frac{\left(4x^2+3x-1\right)}{\left(x-3\right)}$

$\left(\sqrt{x}+\sqrt{2y}\right)+\left(\sqrt{x}+\sqrt{32}\right)$

$\frac{d^2y}{dx^2}-\frac{10dy}{dx}=-25y$