$y\left(1\:+\:cos\:xy\right)\:dx\:+\:x\left(1\:+\:cos\:xy\right)\:dy\:=\:0$
$\int\frac{4}{x^2+9}dx$
$-\left(-1+3\right)^2$
$32a^2+26z+8az\:+\:12az+48z^2\:+\:12a^2$
$2v-3u+5w+v+5u-7w$
$2cosx-sen^2x-1$
$5x^2\:-\:6xy\:+\:y^2\:por\:4x\:-\:11y$
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