$a^4+2a^2-24$
$sin\left(2x\right)+2sinx$
$-\left(5p+2.9q+8\right)$
$2x^2+5\left(x-1\right)=x^2+9$
$9-\left|-4-\left(-6+3\right)-2\right|$
$2a^8\cdot2a^6$
$12\:-\:6\:\left(-2\:-\:8\right)$
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