$7\:-\:\left(-\:14\right)\:$
$senx\:=sen2x$
$4m^2-144n^2$
$\csc^2x-4\cot x-2$
$y2-2y$
$\lim_{x\to\infty}-\left(\frac{x^3}{x+1}\right)$
$r\:sen\:\left(t\right)\:=\:r^2\:cos^2\left(t\right)$
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