$69.20+29.14$
$2\left(-2\right)^2+3\left(-1\right)^2-6\left(-1\right)$
$tan=\frac{5}{4}$
$7a-4b+a-3b-8a+7b$
$\frac{1}{-9z^{-4}}$
$\int\left(\pi sec^2\left(\pi x\right)\right)dx$
$797,5+36,1+49$
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