$\left(x^2+4\right)\left(x^4-4x^2+16\right)$
$2a+6b^2$
$\int10sec^25x\left(tan^45x\right)dx$
$\int _ { 2 } ^ { 2 } d x$
$-15\cdot\left(-2-2\right)$
$-9\left(x-7\right)\left(x+3\right)$
$-5x^2-2x^2$
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