$\frac{d}{dx}x^2+y^3=9$

$\int7x^2\left(9+x^2\right)dx$

$\left(10a+3b\right)\cdot\left(10a-3b\right)$

$\frac{sin\left(x+\frac{\pi}{2}\right)}{sin\left(\pi-x\right)}$

$-\frac{6x}{4}=12$

$\frac{dy}{dx}=e^{-x}-3\cdot y$

$\frac{1}{\sec\left(x+1\right)}-\frac{1}{\sec\left(x-1\right)}$