$\left(x-\left(-5\right)\right)\left(x-3\right)+\left(y-2\right)\left(y-6\right)=0$

$a^2-9a-8$

$\frac{\cos\left(x\right)^2+2\sin\left(x\right)}{\sin\left(x\right)}$

$x\sqrt{1-y^2}dx\:+y\sqrt{1-x^2}dy\:$

$\int-x.\log\left(\frac{c}{x}\right)dx$

$x^2-8x\ge0$

$\frac{20x^3+46x^2+19x+4}{5x+4}$