$\left(-10\right)\left(-2\right)+15-\left(-4\right)$
$\sqrt{x-1=6}$
$1x^2+18x$
$3\left(a-4\right)^2$
$x=\tan\left(66\right)\cdot25$
$9+-68+17+8+-44$
$\frac{1+\sin\left(a\right)}{\cos\left(a\right)}$
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