$\sin2\left(x\right)=-\frac{\sqrt{2}}{2}$
$\int_3^95e^{-2x}dx$
$\int_0^{\infty}\left(\frac{20}{\left(2x+1\right)^3}\right)dx$
$14d\:+\:21\:and\:7\left(2d\:+\:3\right)$
$\sqrt{-81}+\sqrt{-36}$
$\frac{d}{dx}\sqrt{1-t}$
$\left(-4+x\right)\left(-4-x\right)$
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