$\int\left(\ln a\right)^2da$
$\left(7+3i\right)\left(-7+5i\right)\left(-8-4i\right)$
$\lim_{x\to0}\frac{5x^2}{\sqrt{\left(1+x^2\right)}-\cos\left(3x\right)}$
$25a^4-166^2$
$a^2-6a^2-1$
$\left(6x^4-m^2\right)\left(6x^4+m^2\right)$
$100^{t^2-0.5t}$
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