$144x^2-1$
$2\left(r+3\right)+3\left(r+7\right)-10$
$3logx+log2=log3x-log2$
$x^2-\frac{3}{4}x=5$
$3x\left(3x-5\right)$
$50-\left(50-100\right)-90$
$\frac{1}{2}\left(sin\left(a+b\right)-sin\left(a-b\right)\right)$
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