$\left(5x+80\right)\left(6x-800\right)$

$3x-2x\cdot 3-3x+4$

$\int_2^{\infty}\left(\frac{1}{\left(\sqrt{1+x^2}\right)}\right)dx$

$\frac{\left(5+7x\right)}{\left(1+2x\right)}\le4$

$\left(\tan\left(x\right)+\sqrt{3}\right)\left(2\sin\left(x\right)-\sqrt{2}\right)=0$

$\left(81+36x^6+\right)$

$\int\cos\left(x\right)\:cos^5\left(sen\:x\right)\:dx$