$\frac{-\sin\left(x\right)-\cos\left(x\right)}{\cos\left(x\right)-\sin\left(x\right)}$
$a^7+128$
$\frac{3x^2}{x^2+2}$
$\frac{\left(x+a\right)^3-x^3}{a}$
$x\:+\:2x\:-4x+9x$
$\left(8x\:-\:5\:+\:2y\right)^2$
$3^{-8}\cdot3^4$
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