$\left(4ab^2c^3\right)\left(5a^3\right)$
$\sqrt{12^2}+9^2$
$\left(-4x^3j^5c\right)^2\:$
$\cos\left(7a\right)\cos\left(4b\right)+\sin\left(7a\right)\sin\left(4b\right)$
$4x+2y=10$
$4x^{-5}$
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