$\left(a\:+\:1\right)\:\left(a\:+\:4\right)$
$\lim_{x\to-\infty}\frac{3x}{3x+xe^x}$
$2x^3-x^2+3;\:x=-1$
$\int\sin^6\left(4x\right)\cos\left(4x\right)dx$
$\left|-56\right|-\left|-89\right|+\left|-65\right|-\left|-16\right|$
$\tan\left(-x\right)\cos\left(x\right)=\cos\left(x\right)$
$x^2+y^2+3x+y+10=0$
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