$9\sec\left(x\right)^2-5\tan\left(x\right)^2=5+4\sec\left(x\right)^2$

$\left(x^2-7x-9\right)\left(x^2+5x+2\right)$

$\int_0^{2\sqrt{3}}\left(\frac{x^2}{\sqrt{16-x^2}}\right)dx$

$12x\le36$

$\lim_{x\to0}\left(\frac{5sin\left(8x^8\right)}{-3x}\right)$

$\int_1^e\left(\frac{\cos\left(x\right)}{\sin^4\left(x\right)}\right)dx$

$x^{-2}+5x^2y=x^6$