$\int_0^{\frac{\pi}{2}}\left(\frac{\sin\left(2x\right)}{\cos^2\left(2x\right)+1}\right)dx$
$z^2-16z+63$
$8x^4-12x^5+20x^3-28x^6$
$-59-x-7x=-3$
$8\sqrt{121}$
$2\cdot y'+10y=1$
$\frac{x-4}{x^2-16}$
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