$4y^2-y+y^2+6y^2-1$

$x\left(\frac{dy}{dx}\right)-y=x^2cosx$

$\frac{1}{\left(2.9999-3\right)^8}$

$\int2\pi\left(x-4\right)sin\left(2x\right)dx$

$\left(3\cdot4\right)^4$

$\lim_{x\to0}\left(\frac{sin\left(3x\right)}{9x^7+x^6+x^5+x}\right)$

$\int cscx\left(cotx-cscx\right)dx$