$\cos\left(x\right)^2-2\sin\left(x\right)^2=3\cos\left(x\right)^2-2$
$x+8=x-5$
$548.02-22.164$
$\lim_{x\to0}\left(\frac{x-\cos x}{r-senx}\right)$
$p\left(x\right)=x^2-x-6\:$
$-13\left(-4\right)$
$\left(1+t^2\right)y'+2ty=2t$
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