$4x^4+4y^4=16$
$\sin\left(\frac{3}{5}+\frac{5}{13}\right)$
$\frac{-56x^{12}y^8}{4x^5y^4}$
$\left(12a+3\right)$
$1+8c+16c$
$\left(9x+2y\right)\left(2x-2y\right)$
$2x\ge-4$
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