$\int_{\frac{\pi}{2}}^{\pi}\left(cos5xcos3x\right)dx$
$-3z-\left|-2z+8z\right|+\left|8x-5m+9z\right|-15x$
$\left(3m+10n\right)\left(3m-10\right)$
$3\csc x-1=0$
$5b^3z^{-2}\cdot8b^{-3}z^6$
$\frac{x^2-1}{x+1}25$
$-121+25x^2$
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