$1.2x+\left[-5x-\left(-2y+-x\:+\:y\right)\right]=\:$
$\left(-2\right)^3\:+\left(-3\right)^2-\:\left(-1\right)^2\:-\:\left(-2\right)^5$
$\frac{2x^4-8x^2-2x-2}{x+10}$
$\left(f^5+2g^2\right)^3$
$\frac{10x^2+2x-2}{x-3}$
$\frac{dy}{dx}=\frac{cos\left(20x\right)}{e^{20y}}$
$\frac{\left(1+cos\left(a\right)+cos\left(2a\right)+cos\left(3a\right)\right)}{cos\left(a\right)+2cos^2\left(a\right)-1}=2cos\left(a\right)$
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