$\left(3x^2-10y\right)^2$

$6x\:-\:5\:-\:4x\:+\:1\:$

$\frac{dy}{dx}=3x+y$

$2x+3y-5x-9y+8xy-2x$

$29x+40\left(x-3\right)+14.5\left(x-3\right)\left(x-5\right)-2.3\left(x-3\right)\left(x-5\right)\left(x-7\right)$

$9x^4y^6+30x^2y^3z+25z^2$

$\frac{\cos\left(v\right)^2}{\sin\left(v\right)^2}-\cos\left(v\right)^2$