$4a-10a+25$
$\frac{4x^3-8x^2}{4x^2}$
$0,1\cdot\frac{di}{dt}+50\cdot i=50$
$2cos^2-1=cos2x$
$4x-4=40$
$\int_0^4\left(\frac{3x^2+x+16}{\left(x^2+16\right)\left(x+1\right)}\right)dx$
$3-2x\le8+4x$
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