$-42\:x\:6$
$9x^2+54x+81$
$\frac{1+tan\left(x\right)}{sin\left(x\right)+cos\left(x\right)}=sec\left(x\right)$
$\left(3-2i\right)\left(4+\sqrt{2i}\right)$
$-6n+n+3n$
$7 x ^ { 2 } + x 4 - y ^ { 2 } = 4$
$\sqrt{7.05}$
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