$\frac{\sin\:\left(2a\right)}{2\tan\left(a\right)}$
$6b=54$
$6\left(d+4\right)$
$\left(x-2\right)^2\ge9$
$-832582+978,817$
$\left(-15\right)+\left(+10\right)-\left(-9\right)$
$\left(\sqrt{7x^4-3}\right)^2$
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