$n\:-\:1\:+\:1\:+\:5n$
$98x-8x^{3}$
$\left(1.4\right)^4\left(1.4\right)^2$
$6\cdot7+8-9$
$-9+3\left(3-7\right)$
$\frac{a+2^3}{a+2}$
$\tan^2=\frac{\sin^2}{1-\sin^2}$
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