$\left(a-x\right)^4$
$\lim_{t\to0}\left(x^{\frac{1}{t}}\right)$
$x y - 21 x = 7 y - 8 x + 9$
$32,784+3,478+0,004$
$\cot^2\left(x\right)=\cos^2\left(x\right)$
$\left(-6+\left(4+2\right)-\left(-9\right)\right)-\left(-4\right)-\left(+7-5\right)+\left(-12\right)+7-15$
$81x^2-12x+36$
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