$\int\frac{\cos x}{\left(1+senx\right)^2}dx$
$54^2+48^2-50^2-52^2$
$\left(-3x^5\:-\:x^3+6x\:-\:1\right)\::\:\left(x^2\:+\:x\right)$
$\int\left(\frac{3x^2+4}{x^2}\right)dx$
$8x^2-20x-96$
$\lim_{x\to0}\left(\frac{\sin\left(5\right)}{2}\right)$
$2b^3\:2^3b^{-7}$
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