$1+cos\left(2x\right)=\tan\left(x\right)sin\left(2x\right)$
$\int te^{-2x}\:dx$
$\left(198\right)^2$
$2\sqrt{5}\:.\:4\sqrt{5}$
$0.9-3x-x^2$
$6\left(a+a+5\right)+4$
$\left(2a+u+4n\right)^2$
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