$\lim_{x\to1}\left(\frac{x^2+x-1}{2x-1}\right)^{\frac{2x+1}{x-1}}$
$\sin x=1-\cos x$
$cos^2x\:+tan^2x\:=sec^2x$
$\left(2x-3y^4z^2\right)^2$
$\frac{1}{16}sin\left(x+y\right)y-y=0$
$\frac{25x^2}{4}-\frac{1}{4}$
$40w^3-87w^3$
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