$0.80-0.77$
$14.85-6.9$
$15+\left(3-\left(-11-\left(13+14\right)-7\right)\right)$
$\cos\left(x\right)-\cos\left(\frac{1}{2}x\right)$
$\left(2x^4y^4\right)^4$
$\frac{1}{5\left(1+5x\right)^2}$
$-15n=30$
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