$2^1\cdot2^{-3}$
$-\frac{301}{7}$
$ab+4b-3a;\:a=7;\:b=6$
$+25x^2\:-\:50x^2\:+\:11x^2\:+2^2$
$2+\sec\left(x\right)\cdot\sin\left(x\right)$
$\sqrt{2+\sqrt{2+\sqrt{2\left(1+\cos\left(8x\right)\right)}}}$
$3x+1\le4x-2$
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