$\int\frac{3x}{x^2-1}dx$
$2sin3x+\sqrt{2}=0$
$\cos\left(7x\right)\cos\left(4x\right)+\sin\left(7x\right)\sin\left(4x\right)$
$5b-10c$
$\lim_{x\to\infty}\:\frac{0^{2n+1}}{1+0^{2n}}$
$\frac{\sqrt{9}-\sqrt{x}}{2\sqrt{a}+\sqrt{x}}$
$\left(4-25\right)-\left(16-24\right)-\left(21-36\right)$
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