$5cos-3=2-2sen^2$
$y^2=0$
$15.9-\frac{4}{11}$
$7a\left(a+3\right)-c\left(a+3\right)$
$-6b+2\left(4-4b\right)$
$\left[\left(-8\right)-\left(-6\right)\right]\left[8\left(4\right)+\left(-1\right)\right]$
$490\cdot1$
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