$cosx=-\frac{\sqrt{2}}{7}$
$-x^2-4x+21$
$\int_0^{\sqrt{4-x^2}}\left(y^2x\right)dy$
$\lim_{x\to\infty}\sin\left(\frac{lnx}{x}\right)$
$\int e^{ax+b}dx$
$2xy^2=0$
$c^{2}\phi\cdot\sen^{2}\phi^{2}\right)\left(\cos^{2}\theta$
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