$\left(2x-1\right)\left(5x+2\right)$
$\lim_{x\to0}\:\frac{x-tanx}{x-senx}$
$\sqrt[7]{x^3y^5}\cdot\sqrt[7]{x^4y^5}$
$\left(x+8\right)\left(x-5\right)$
$\lim_{x\to5}\left(\frac{x^2-5x}{x-5}\right)$
$\lim_{x\to0}\left(\frac{2}{-\left(\frac{1}{cosx}\right)^2}\right)$
$\left(2^2+1^2\right)$
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