$36x^2-25y^2$

$y'\:=\:6x\:-\:xy\:-\:y\:+\:6$

$\frac{cot\left(x\right)}{sin\left(2x\right)}=\frac{1}{\:\left(1\:+\:cot^2\left(x\right)\right)}$

$\int\frac{1}{u^{3}-2v^{2}+u}dx$

$\int_0^x\left(\frac{1-cos\left(t\right)}{t^2}\right)dt$

$3x^2-8x+-2x^2+x-4$