$1\left(-1\right)-\left(-2\left(-1+\right)\right)\left(-4\right)$
$-7,42-1,88$
$36z^4-42z^2$
$4x^2+8=36x$
$\left(3x+6\right)\left(3x+4\right)$
$\left(-3\right)-\left(-2\right)+\left(-6\right)\cdot\left(-15\right)+18$
$\frac{dy}{dx}\left(ay+bx=by-ax+\left(x+y\right)\sqrt{a^2-b^2}\right)$
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