$4x\:+\:3y\:+2\left(-2x+y\right)+4x-\left(3x+2y\right)$
$9^9.9^7$
$\frac{d^2}{d^2x}\left(x^2ln\left(9x\right)\right)$
$-y^3dy=xdx$
$100-\left(-29\right)$
$3\sin\left(2x\right)+2=4$
$\frac{1-\cos^2\left(x\right)}{1+\cos^2\left(x\right)}$
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