$4a^2-8a+16$
$4-3.91$
$\frac{4sin\left(x\right)}{cos^2\left(x\right)}=2\cdot sin\left(2x\right)\cdot sec^3x$
$2x-3=x+1$
$12+5\left(-4\right)$
$20+90+bc$
$\frac{d}{dx}\left(x^2+5\right)^x$
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