$\left(\frac{t}{2}-2n\right)^2$
$16+8x^2+x^4$
$\int\frac{1}{x\sqrt{16x^2+25}}dx$
$( x - \frac { 1 } { 2 } ) ^ { 2 }$
$-0,23\:+0,7$
$0.6931471805599453\:\cdot0.3620454462036935\:$
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