$-28:7+\sqrt{16}$
$\frac{2}{1+\cos\left(2x\right)}=\sec\left(x\right)^2$
$\frac{9x^2+5}{3x}$
$\frac{dy}{dx}\left(e^ysin\left(x\right)+3xy-1\:\right)$
$\left(2a+3b\right)\left(2a-3b\right)=4a^2+\left(-6ab\right)+\left(6ab\right)+\left(-9b^2\right)$
$-30h-3$
$\int2x\sqrt{7-9x}dx$
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