$-5\cdot4-3$
$\sin\left(4x\right)\cos\left(5x\right)$
$-\left(2+\sqrt{3}\right)x$
$\int_{2.5}^{0.5}\left(\frac{3}{\sqrt{3x-x^2}}\right)dx$
$\lim_{x\to-1}\left(\frac{x^4+x^5}{x^5-2}\right)$
$2x+x+x$
$4x^2+5x+1=0$
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