$2x<4$
$20+910+51$
$\frac{tan\:x}{sen\:x\:\left(1+\tan\left(x\right)\right)}$
$\frac{d}{dx}\left(14-14x^2\right)$
$9x^2-9x-4$
$\sec\:^2\left(x\right)-2\sec\:\left(x\right)\tan\:\left(x\right)+\tan\:^2\left(x\right)$
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