$-9r^2+4s^2$
$-4+8-34-67+2$
$\int\left(x^2-3\right)^32x\:dx$
$\frac{4x^7sinx}{9\sqrt{secx}}$
$\log_{10}\left(2\right)-\log_{10}\left(y\right)=4$
$\ln\left(a\right)=25.884$
$\left(-1863\right)-\left(-515\right)$
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