$\left(\frac{25\cdot\:i^2-30in+9n^2}{n^2}\right)\:\cdot\:\left(-3+\frac{5i}{n}\right)$
$\int_2^3\left(2x+1\right)dx$
$\frac{12x+10y}{2}$
$16h^4-625$
$\cos\left(a\right)+\cos^2\left(a\right)$
$0^{54}$
$\left(17-5i\right)-\left(16-11i\right)$
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