$\left(7x-11\right)\left(7x+11\right)$
$\lim_{x\to-infinity}\left(\frac{sinx+\cos^3x}{x^2+1}\right)$
$+1-\left(+3-\left(-8\right)-\left(+8\right)\right)+\left(+6+\left(+8\right):\left(+4\right)\right)$
$\left(x-1\right)\left(x-5\right)>0$
$\sqrt[2]{4y}.\sqrt[4]{8y^3}$
$4^2-4\left(1\right)\left(4\right)$
$2d^2+6d^2+5+2$
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