$sec\left(2x\right)\cdot cos\left(2x\right)$
$\frac{125n^{12}-343b^6}{5n^4-7b^2}$
$\left(6x-5\right)\left(2x+1\right)$
$\frac{5x^2+20x+19}{x+3}$
$2\cos^2x-3\cos x+1=0$
$\frac{9^2}{4}+ab+b^2$
$22,7-0,662$
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