$5-\sin\left(x\right)^2$

$9x^2+x+9$

$13ab+\left(-12ab\right)-4ab$

$\cot\left(a\right)^2-\cos\left(a\right)^2=\cot\left(a\right)^2\cos\left(a\right)^2$

$\frac{dy}{dx}=10\sqrt[4]{xy}$

$245-\left(-437\right)$

$\frac{1+\sin\left(x\right)}{\cos\left(x\right)}=\frac{1+\cos\left(x\right)+\sin\left(x\right)}{1+\cos\left(x\right)-\sin\left(x\right)}$