$48+88-30-55+5+2$
$5x-2y=4$
$2a-21=1$
$\frac{1+cosx}{sin^2x}$
$53-\:\left(16\:-\:9\right)\:$
$\int\sin\left(a+x\right)^2dx$
$s^2+6s+13$
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