$25z^2+70z+49$
$-2a^2-4a+6$
$\int\left(x^{\frac{1}{2}}sec\left(5x^{\frac{3}{2}}+4\right)\right)dx$
$\frac{8a^3-43a^2-25a-30}{a-6}$
$\left(x+y\right)^2-2\left(x+y\right)\left(x-y\right)+\left(x-y\right)^2$
$6-4:2-5.3+6:2.2$
$16z^2-169$
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