$\cos\left(5x\right)\cos\left(3x\right)$
$\lim_{x\to\infty}\frac{ln\left(x-a\right)}{\sqrt{x-a}}$
$y^4-6y^2z+9z^2$
$-6+0+-1+-3$
$\left(5x^4-y\right)\left(5x^4+y\right)$
$\int\:2x^6\:sen5x\:dx$
$3x-6-3x+13$
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