$1.-\frac{3}{3}$
$cos^{-1}b=\frac{29}{36}$
$\frac{xyz^0}{x^{-2}z^3}$
$\int sen^4\left(\frac{x}{2}\right).\cos^2\left(\frac{x}{2}\right)dx$
$3x+1>x-15$
$-15-y$
$144a^2-96a+16$
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