$\frac{\sin\left(-x\right)}{-\cos\left(x\right)}$
$\lim_{x\to0}\:e^x-sen\:2x-1$
$4\cdot2700$
$\lim_{x\to\infty}\frac{1}{x}\cos\left(x\right)$
$\int\left(x^3\cdot\cos\left(\frac{x}{2}\right)+\frac{1}{2}\right)\cdot\sqrt{4-x^2}dx$
$\int\frac{4}{1+x}dx$
$6y^{2}-5y-2$
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