$fu\cdot n=x^2$
$\int\left(\pi-x\right)\left(xsin\left(x\right)\right)dx$
$\sin\left(30\right)\cdot\tan\left(30\right)+\cos\left(30\right)=\sec\left(30\right)$
$\left(-6a+8x\right)^2$
$2025:\left(+135\right)$
$4\left(s+2\right)$
$40ax-10bx-4by+228ay$
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