$\left(1-\frac{1}{\sec\left(x\right)}\right)\left(1+\sec\left(x\right)\right)=0$
$4\left(6-4\right)+\sqrt{4}+\sqrt{25}-2\left(5-4\right)^2$
$4^8.16^2.64^3$
$\left(15\right)\::\:\left(+3\right)\:+\:\left(-3\right)$
$\frac{6^2-2\left(6\right)\left(7\right)+7^2}{6-7}$
$-9y^2+2y^2$
$\frac{dy}{dx}=xe^{6x+5y}$
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