$\left(2+7\right)\cdot\left(-2\right)$
$\:ln\:\sqrt{\frac{1+sin\:x}{1-sin\:x}}$
$27m^212-n^215$
$5^{\frac{2}{4}}$
$\int sin\left(x\right)\cdot\cos\left(nx\right)dx$
$-\frac{1}{3x}-1$
$\left(a\frac{1}{3}\:+\:b\frac{4}{3}\right)^2$
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