$\frac{\cos2a-\cosa+1}{\sin2a-\sina}\equiv\cota$
$61-5+1$
$cos^2\left(4x\right)-sin^2\left(4\right)$
$6\left(3x^2-14x+15\right)$
$-4x^3y+2xy^3$
$\lim_{x\to+infinito}\frac{2^x}{x^2}$
$z^6=\:-1$
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