$30\cdot\left(-18\right)$
$\frac{1}{t}\int_0^tr\left(t\right)dt$
$\frac{cos^2x+cotx}{cos^2x-cotx}$
$-13+-28+65+-56$
$\cot\left(x\right)\cot\left(y\right)-1$
$n^2-6n-40=0$
$\left(m^2-2m^2n+2n^2\right)^2$
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