$\left(10x+10y\right)^3$

$\int\left(x\sqrt{6+9x}\right)dx$

$9x^2-20x-21=0$

$\left(x+3\right)\left(x\right)=75$

$60x^2y-48xy^2+72x^3y$

$\cos\left(\cos\left(-\frac{4}{5}\right)+\sin\left(\frac{2}{5}\right)\right)$

$\frac{\left(\left(\cos\left(x\right)\cdot\sec^2\left(x\right)\right)-\cos\left(x\right)\right)}{\tan\left(x\right)}$