$4\cdot1-3$
$\int\frac{\left(2x^4+5x^2+2x+3\right)}{\left(x^2+1\right)^3}dx$
$ab+106+25-16+5y^2$
$2y^2-5y+3$
$\frac{dy}{dx}=\left(\frac{xy\left(1-y\right)}{1+x}\right)$
$cot^2\left(x\right)-cos^2\left(x\right)=cot^2\left(x\right)\cdot\:\:cos^2\left(x\right)$
$\left(2y+y^4\right)^2$
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