$\left(6x^2y-2yz^2\right)^2$
$130\:-\:\left(-210\right)$
$\left(a^{3}\right)^{3}$
$\infty-1000$
$3-2\:x\:5\:+7\:x\:4$
$\left(-138\right)\cdot15+\left(-138\right)\cdot2+\left(-138\right)\cdot13$
$\cos\left(270+x\right)=\sin\left(-x\right)$
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