$\frac{1}{2}\int\sec^3dx$
$x^2+15x+3=0$
$3a^2+5^2$
$2\left(2x-7\right)=-34$
$4x^2-22x+121$
$\frac{\left(x+1\right)^n}{\left(2n+1\right)^2\cdot2^{3n}}$
$35.28-33.086$
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