$-b^-a^-\left(3a^4\right)$
$\frac{1}{1+sinx}+\frac{1}{1-sinx}=0$
$\left(5ab^{12}-3a^{11}b^9\right)^2$
$\left(5c-3d\right)\left(5c+3c\right)$
$-4x\left(6x-7\right)$
$1,289+453$
$16mn+2mn+9n^2$
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