$60\cdot8$
$\left(+4\right)-\left(+2\right)-\left(-5\right)+\left(-1\right)-\left(-2\right)$
$sin^2x\:=\:tan^2$
$x^2+4x+-4>0$
$\frac { 2 n - 2 n } { 2 n }$
$\sin\left(\tan^{-1}\left(u\right)\right)$
$\lim_{n\to0}\left(\frac{\left(-1^n\right)x^n}{n-1}\right)$
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