$2-8\cos^2f=0$
$-15\left(20-12+\left(-13+10\right)-2\right)$
$\frac{6}{\frac{2}{7}}$
$\frac{cos\left(\theta\right)-sin\left(\theta\right)}{sin\left(\theta\right)}+\frac{cos\left(\theta\right)+sin\left(\theta\right)}{cos\left(\theta\right)}$
$\frac{3.26}{\cdot4.6}$
$\frac{x^3-3x^2+2x-10}{x-5}$
$-7\left(10+5z\right)+13$
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