$\frac{26^{18}}{26^{16}}$
$4tan^2x=tanx$
$\left(1+\cot^2\left(x\right)\right)\tan\left(x\right)=\csc\left(x\right)\sec\left(x\right)$
$\int5e^{-0.2x}dx$
$\frac{5x-2x^2-1}{2x-1}$
$sin\left(\frac{x}{2}\right)=\sqrt{2}-sin\left(\frac{x}{2}\right)$
$-16v^2+72>25$
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