$-ih\left[-aksin\left(kx\right)+akcos\left(kx\right)\right]$
$\int_{\frac{\pi}{2}}^{\pi}\sqrt{1-\text{sen}^2\left(\theta\right)}d\theta$
$-6-5x^2+7x^2-7y^3+y^3+4+2x^2$
$2^6\cdot2^{-1}$
$2b\left(2a-3\right)\left(2a+3\right)$
$+4x+1x-2$
$mx-m-x+1$
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