$tana=\frac{1}{cota}$
$a+b\cdot c;\:a=5;\:b=25;\:c=10;$
$\sec\:\left(x\right)-\sec\:\left(x\right)\sin\:\left(x\right)+\tan\:\left(x\right)-\tan\:\left(x\right)\sin\:\left(x\right)$
$\left(x^2-2\right)\left(x^2+4\right)$
$\frac{1}{4}.\left(x-\frac{2}{5}\right)\ge2.\left(\frac{1}{4}x+\frac{1}{5}\right)$
$\lim_{x\to\infty}\frac{x^4+5x^2-x}{x^5-4x^3}$
$\left(-5ab^2\right)^3$
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