$\lim_{x\to0}\left(\frac{e^x-e^{-x}-2senx}{xsenx}\right)$
$\cos2v-\sin4v$
$\sin\left(x\right)\cos\left(\frac{9}{19}\right)=1$
$\cos\left(v+u\right)$
$\int\frac{9w^2+4w-11}{w^3-7w-6}dw$
$m - n + x ( m + n )$
$\cos^{2}\theta$
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