$\int6cos^4xdx$
$cosx=-\frac{1}{2}$
$\lim_{x\to+3}3sin\left(x\right)ln\left(x\right)$
$3\:+\:4\:-5\:+\:2\:-1$
$10abz-20az$
$751.638\cdot924$
$-2x^2-8x+3-9x^2+x+3$
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