$\left(2x-3\right)\left(2x-3\right)-\frac{\left(x-3\right)^2}{x-3}$

$\frac{-6x+3}{2x+1}$

$1+2+3+4+5-6$

$\left(x+2\right)\left(x+3\right)v^2-162$

$\int\frac{11x+51}{\left(x^2+7x+12\right)\left(x-3\right)}dx$

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

$sin^2x+sin^4x$