$7x\:-\:14$
$\sin\left(2a\right)-\tan\left(a\right)\cos\left(a\right)$
$\left[10-\left(21-14\right)\right]-\left[5+\left(17-11+6\right)\right]$
$\frac{d^2}{dx^2}\left(e^{x^4+2x^2}\right)$
$\left(4x+9\right)+\left(13-4x\right)$
$\frac{1-x^8}{1+x^4}$
$3x^2-6+2x\ge0$
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