$\frac{d^2}{dx^2}\left(-2sin\left(x\right)\right)$
$0.3\sqrt{0.275}$
$x^2+2bx+bx$
$\left(5-7\right)\cdot\left(-4+1\right)$
$\left(b-3y\right)\left(b+15y\right)$
$t+4+3-2t$
$\lim_{x\to0}\left(\frac{\arcsin\left(4x\right)}{x}\right)$
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