$\sin\left(a+270\right)$
$\lim_{x\to infinito}\left(\frac{-3x^2+2x}{4x}\right)$
$-r+6r-5\left(6r-4\right)$
$1x^4-5x^3+5x^2+5x-6$
$x^4-x^2x\:+x^3+4x^2\:5+7x^2-4x+6$
$-t^2+4t-3$
$\int\frac{x-12}{\left(x-5\right)^3}dx$
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