$\sin\left(x\right)+\sin\left(x\right)\cos\left(x\right)=\csc\left(x\right)$
$\lim\:_{x\to0}\:\:\left(\frac{\left(1-e^{x^4}\right)}{\left(x^2\cdot\:sin\left(x^2\right)\right)}\right)$
$a^2-2a-48$
$\left(\sqrt{7}+2\right)\left(\sqrt{7}-2\right)$
$\left(4a^2b\:-\:3a\right)\left(4a^2b\:+\:9a\right)$
$x-3=5$
$\int\frac{2x^2+4}{x\left(x^2+4\right)}dx$
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