$\tan30\left(\cos45-\csc60\right)$
$\frac{dt}{dx}=xt$
$\left(\:-37\right)\:-\:\left(\:-72\right)$
$-8\:-\:\left(-20\right)$
$40\cdot89$
$\sqrt{a\sqrt{a\sqrt{a}}}$
$-15x-40=23-8x$
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