$-18:6-35:\left(-7\right)+\left(-11\right)$
$7^{-2}a^5b^{-3}$
$3\left(-2\right)-2\left\{5\left[\left(3-5\right)\left(-2\right)-3\right]\:\right\}$
$\left(3x^2y^2z^5\right)\left(2x^2y^3z^2\right)$
$cot\left(-a\right)cos\left(-a\right)+sin\left(-a\right)$
$\frac{dy}{dx}=2\cos\left(x\right)^3$
$2x^2+4x-3=0$
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