$\left(8-2a\right)\left(6-2a\right)\left(x\right)$
$-15+4x<13$
$\lim_{x\to0}\left(\frac{x}{\left(x+1\right)^2}\right)$
$\frac{9^4}{3^4}$
$sinxcosx=sinxcosx-cosx$
$5\cdot5\cdot b$
$\cos8^{\circ}\cdot\cos22^{\circ}-\sen8^{\circ}\cdot\sen22^{\circ}$
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