$-33x+16x+27x$
$\frac{di}{dt}=b\cdot i-b\cdot i^2$
$2x+7x+x-8x$
$3x^2+12x-3=0$
$\sin^{4}x-2\sin^{2}x+1=\cos^{4}x$
$\int\frac{2+e^x}{\left(2x+e^x\right)^8}dx$
$2\left(cos300+isin300\right)$
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