$x2+x-20$
$-4\left(-3\right)\left(-3\right)\left(-4\right)\left(-4\right)$
$2\cdot1+2\cdot1-3-1$
$5a+3a-2a+7a+3a$
$25x^2-110xy+121y^2$
$\frac{-\sin\left(x\right)^2+\sin\left(x\right)+1}{\cos\left(x\right)}$
$4\cdot x=18.8$
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