$\sin\left(360-x\right)=-\sin\left(x\right)$
$\int\frac{4x^2-x-1}{\left(x+1\right)\left(x-3\right)}dx$
$\frac{sen^{4\:}-cos^4}{1-cosx}=1$
$25=5^{x-5}$
$4x^2y+6yx^2$
$2v-2\le3v$
$\left(2xy^{2}-3\right)dx+\left(2x^{2}y+6\right)dy=0$
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