$\frac{cos\left(2x\right)}{cos\left(x\right)-sin\left(x\right)}$
$3x^2-x^2+6x-2$
$\:\left(x^5\right)^9$
$3\sqrt{\left(-6-2\right)^{-2}}$
$3a\left(a^2-3a+4\right)-4\left(3a^3-2a^2\right)$
$15x-14=12x+4$
$36-\left(-25\right)$
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