$4sin^2x+2sinx=0$
$y=x+ae^x+be^-x$
$\int\left(\frac{2t-4}{t^2+9}\right)dt$
$\int_{\:0}^{\infty}u^2e^{-u}du$
$-34-\left(-15\right)+7-9$
$5a-8a+a-6a+21a$
$-2x^4+5x^3+x^2+x$
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