$\left(1000\cdot1\right)+\left(-20000\cdot\frac{1}{100}\right)+\left(-50000\cdot\frac{1}{200}\right)+\left(-60000\cdot\frac{1}{400}\right)$
$\frac{m^6-49\cdot n^6}{m^3+7\cdot n^3}$
$27y^3+216$
$7^2-6^2+4^2$
$\int\left(r^2-x^2\right)^{\frac{1}{2}}dx$
$\left(m+6\right)\left(m-4\right)$
$\frac{1}{1-sec\left(x\right)}-\frac{1}{1+sec\left(x\right)}=-2cot^2\left(x\right)$
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