$125x^3+343n^3$

$\frac{d}{dx}\left(l\sin\left(x\right)\right)$

$\int_1^{\infty}\left(\frac{1}{x\left(6x+7\right)}\right)dx$

$5a^2b^3\left(ab^2-a^2b+4a\right)$

$\left(3\sin\left(x\right)\right)\left(\cos\left(x\right)\right)=\left(3\sin^2\left(x\right)\right)\left(\cot\left(x\right)\right)$

$\cos\left(x\right)\sqrt{1+\tan^2}$