$\int_{-4}^2x\left(\left(-4x+9\right)-\left(x^2-2x+1\right)\right)dx$

$\lim_{x\to-1}\left(\frac{\left(3x^4+7x^3+8x+12\right)}{x+1}\right)$

$y'\:+2ty=3t$

$\left(4\cdot5\right)^2$

$\sin\left(270-x\right)$

$\lim_{x\to-9}\left(\frac{x+9}{9x^2-81}\right)$

$x\left(ln\left(x\right)-ln\left(y\right)\right)dy=-y\:dx\:$