$36x^2+36x+36y^2$

$\left(y\cos\left(xy\right)-5x^4\right)\cdot dx+\left(x\cos\left(xy\right)+5y^4\right)dy=0$

$\lim_{x\to6}\left(\frac{\left(x+2\right)}{\left(x-6\right)^2}\right)$

$x^2y^2z^2+3x^2y^2z^2$

$4x^2+2x-12$

$coe\:f\left(6-\sqrt[3]{\frac{36}{78364164096}}\right)^{19}$

$\csc^2x+cot^2x=1+2cot^2$