$\frac { 12 x ^ { 4 } + 5 x ^ { 3 } - 4 x ^ { 2 } + 8 x - 5 } { x - 8 }$

$\frac{tan\left(x\right)}{tan\left(x\right)+cot\left(x\right)}$

$38-\left(-23\right)$

$\sin^2\left(x\right)=\sin^2\left(x\right)-\cos^2\left(y\right)$

$\left(5m^2-2n+1\right)^2$

$2\left(4x\right)^2+4x$

$\:\frac{1}{x^2-3x+2}$