$\frac{\sec\left(x\right)-\cos\left(x\right)}{\sec\left(x\right)\cdot\tan\left(x\right)}$

$\int\frac{x-3}{\left(x-1\right)\left(x^2-1\right)}dx$

$\frac{d}{dx}\:4$

$y^4-6y^2z+9z^2$

$-3\sqrt[2]{81}$

$8\left(4^2\right)+-3\left(2\right)\left(-5\right)+-4\left(-3\right)$

$y^{\prime}=x\left(y^{2}+1\right)$