$\frac{y'}{t}=\frac{t}{\sqrt{1-t^2}}$
$\left(x^2-1\right)\cdot\left(x^2+1\right)+1$
$-6xy^3+12xy^3-8xy^3+10xy^3$
$4\left(a-b\right)^2$
$\lim_{x\to-4}\left(1-\tan5x\right)$
$2a-ab^2\cdot2a-ab^2$
$x^2-12x+29$
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