$sec^4x-2sec^2x$
$\left(+600\right)-\left(-140\right)$
$\left(3.3-12\right)$
$\left(\frac{2}{3}m^2+\frac{1}{5}n\right)\left(\frac{2}{3}m^2-\frac{1}{5}n\right)$
$11^2+5\cdot\left(8-3\right)^2-7^5+7^3$
$9x^2-25<0$
$\lim_{x\to0}\left(e^x+2x\right)^{\left(\frac{1}{x}\right)}$
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