$\sec\left(ceta\right)=\frac{5}{3}$
$\sin^4t-cos^4t=2\sin^2t-1$
$\sqrt{144\cdot49}$
$\left(u+2\right)\left(u-2\right)$
$\int\frac{4e^{3x}}{e^{3x}+1}dx$
$\ln^2\left(2x+1\right)$
$\left(1+.10\right)^{2.5}$
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