$\left(2x+3\right)\left(2x-3\right)^2$
$\left(a\cdot a\right)+5\left(a\cdot a\right)+3\left(b\cdot b\right)+2\left(a\cdot a\right)-5\left(b\cdot b\right)$
$\frac{sin\left(x\right)}{\cos\left(x\right)}+\frac{sin\left(y\right)}{cos\left(y\right)}=\tan\left(x\right)+tan\left(y\right)$
$sin\:3a=-\frac{\sqrt{3}}{2}$
$800-50$
$14=d-u-6$
$\left(+8\right)x\left(-40\right)$
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