$25a^4-9c^2$
$a^2-a+12$
$\int6x\left(x^2+1\right)^{\frac{1}{3}}dx$
$12xy+27x-28y-63$
$\left[-34-\left(45+63-75\right)+23\right]$
$\left(8+2\right)\cdot9$
$\cot\left(\frac{\pi}{2}-x\right)\cdot\cos\left(x\right)$
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