$1-\frac{\tan\left(x\right)^2}{1+\tan\left(x\right)^2}=1-2\sin\left(x\right)^2$
$-\frac{44}{5}x+5$
$2b^5-b^3$
$y'+y=xy^4$
$-6+2\left(-9\right)+3\left(3\right)$
$-45-\left(-12\right)$
$36m^2+60mn+16n$
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